DesclassificadoDocumento

65 HS1-834228961 62-HQ-83894 Serial 164

Agência: FBI
Data do incidente: —
Liberação: 08/05/2026
Ano: 2026

O arquivo de caso 62-HQ-83894 do FBI inclui registros investigativos, depoimentos de testemunhas oculares e relatórios públicos referentes a Objetos Voadores Não Identificados e discos voadores documentados entre junho de 1947 e julho de 1968. Os registros incluem relatos de incidentes de alto perfil, evidências fotográficas de locais como Oak Ridge, TN, e propostas técnicas sobre potenciais sistemas de propulsão. Tópicos adicionais incluem programas de convenções, relatos de pesquisadores e extensa cobertura da mídia do período. Este arquivo está parcialmente publicado no cofre do FBI com mais tarjas e algumas páginas faltando. Incluído aqui está o arquivo de caso completo com várias páginas recém-desclassificadas e apenas pequenas tarjas.

+ Ver original em inglês

The FBI's 62-HQ-83894 case file includes investigative records, eyewitness testimonies, and public reports concerning Unidentified Flying Objects and flying discs documented between June 1947 and July 1968. The records include high-profile incident accounts, photographic evidence from sites like Oak Ridge, TN, and technical proposals regarding potential propulsion systems. Additional topics include convention programs, researcher accounts, and extensive media coverage from the period. This file is partially posted on FBI vault with more redactions and some pages missing. Included here is the complete case file with several newly declassified pages and only minor redactions.

Transcrição em português

Tradução automática

62-HQ-83894

Seriais EBF 164

NÃO DESTRUIR

REGISTROS CENTRAIS

Nº de Classe/Caso Sub Vol. Serial #

0062 83894 1 164 APENAS

8/11/1974

FOIPA #1140060

NÃO DESTRUIR

Autoridade de desclassificação derivada

RESTRITO

DEPARTAMENTO DA FORÇA AÉREA
QUARTEL-GENERAL DA FORÇA AÉREA DOS ESTADOS UNIDOS
DIRETORIA DE INTELIGÊNCIA
WASHINGTON 25, D. C.

15 de fevereiro de 1949

REQUISITOS DE INTELIGÊNCIA AÉREA
MEMORANDO NÚMERO 4

AERONAVES NÃO CONVENCIONAIS

PARTE I - GERAL
1. PROPÓSITO
O propósito deste memorando é duplo:

a. Enunciar os requisitos contínuos da Força Aérea para informações referentes a avistamentos de aeronaves não convencionais e objetos voadores não identificados, incluindo os chamados “Discos Voadores”.

b. Estabelecer procedimentos para o relato de tais informações.

2. REVOGAÇÃO
O Memorando de Coleta do Departamento do Exército Número 7, datado de 21 de janeiro de 1948, e a carta, CSGID 425.1, datada de 25 de março de 1948, ambos com o assunto acima, que foram transferidos para agências da Força Aérea para ação, são por meio deste substituídos.

3. RELATÓRIO
a. Geral
(1) Uma resposta tão completa quanto possível aos requisitos enunciados na Parte II deve ser enviada por meio de transmissão elétrica imediatamente após os avistamentos.
(2) Relatórios suplementares devem ser encaminhados conforme disponíveis pelos meios mais expeditos, consistentes com a importância da informação relatada.

Comandos Aéreos Principais (Ultramar) e Adidos Aéreos
(1) Relatórios iniciais e suplementares via cabo serão transmitidos ao Diretor de Inteligência, Quartel-General da Força Aérea dos Estados Unidos. Os cabos conterão a frase: “Passar para COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
(2) Relatórios escritos suplementares, preparados no Formulário AF 112, serão encaminhados ao Diretor de Inteligência, Quartel-General da Força Aérea dos Estados Unidos.
(3) O Comandante Geral do Comando de Material Aéreo está autorizado a manter contato direto com os principais Comandos Aéreos (ultramar) e organizações sob seu controle em conexão com o desenvolvimento de informações sobre este assunto.

Comandos Aéreos Principais (Zona Interior - ZI)
(1) Os relatórios serão encaminhados diretamente ao Comandante Geral, Comando de Material Aéreo, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3, pelas instalações que receberem informações referentes aos requisitos enunciados na Parte II.
(2) Cópias de tais relatórios podem ser fornecidas ao Quartel-General do Comando da instalação em questão.
(3) Uma cópia de todos os relatórios enviados ao Comando de Material Aéreo de acordo com estas instruções será encaminhada ao mesmo tempo ao Diretor de Inteligência, Quartel-General da Força Aérea dos Estados Unidos.
(4) Relatórios escritos serão submetidos no Formulário AF 112.
(5) O Comandante Geral do Comando de Material Aéreo está autorizado a manter contato direto com os principais Comandos Aéreos (ZI) e organizações sob seu controle em conexão com o desenvolvimento de informações sobre este assunto.

Agências Não pertencentes à Força Aérea
(1) Destinatários que não sejam da Força Aérea dos Estados Unidos são solicitados a encaminhar relatórios diretamente ao Comandante Geral, Comando de Material Aéreo, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) A fim de reduzir o fator tempo envolvido na transmissão deste tipo de informação, solicita-se que, sempre que as instalações de comunicação permitirem, os elementos subordinados sejam autorizados a comunicar relatórios diretamente ao Comandante Geral do Comando de Material Aéreo.

PARTE II - REQUISITOS
1. Data do avistamento.
2. Hora do avistamento (zonal pelo relógio de 24 horas).
3. Local do avistamento (posição do observador):
a. Solo
(1) Cidade, vila.
(2) Distância e direção da cidade ou vila, estrada, cruzamento, etc.
(3) De edifício (andar), quintal, etc.
(4) Coordenadas de mapa (se viável) mostrando latitude e longitude.
[...]

+ Ver transcrição original em inglês

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Serials EBF 164

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DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”

b. To establish procedures for reporting such information.
2. RESCISSION

Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
8. REPORTING

a. General

(1) As complete an answer to the requirements enunciated in Part Il, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”

r: NCLOSI JRE
RESTRICTED 09-4892, AF

. ) RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

(8) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.

c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.

(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART I - REQUIREMENTS
General

1. Date of sighting.

2. Time of sighting (zonal by 24 hr. clock).

3. Where sighted (observer’s position):

a. Ground

(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.

(8) From building (story), yard, etc.

(4) Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

RESTRICTED @

Type aircraft, speed, altitude, direction of flight.
Distance and direction from city, town or known landmark.
(3) Clock position of object from observer’s aircraft.

(4) Latitude and longitude.

(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.

5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)

6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude,
Time in sight.
Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
Apparent construction. (Of what material or substance)
Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
Direction of flight.
Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.
a. Color of smoke.

yb. Length and width.

RESTRICTED

e RESTRICTED

ce. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
¢. Reflected on cloud.
d. Showed thru cloud.
Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
Support
Wings.
Aerodynamic list of fuselage.
Vertical jet.
Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
Propulsion.
Propeller or jet.
Rotor.
Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
Visible exhaust or jet openings.
Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.

(3) Location.

RESTRICTED

Air ducts.

a. Slots.

b. Duct openings.

Speed - M.P.H.

Sound.

a. Continuous whine or buzz.

b. Roar, whistle, whoosh.

c. Intermittent.

Manner of disappearance.

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view.

Disappeared behind obstacle.

Relative to the Observer

Name of observer.

Address.

Occupation.

Place of business.

a. Employer or employee.

Pertinent hobbies.

a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
Ability to determine:

a. Color.

b. Speed of moving objects.

¢. Size at distance.

Reliability of observer.

a. Sources.

RESTRICTED

@ ~=-kestricten

(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer,
8. Notes relative to observer on:

a. Sightings in general.

b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.

ce, Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.

9, Witnesses.
a, Addressees.
b. Occupation.
c, Reliability.

Comments of interrogator regarding the intelligence and character of person interrogated.

Relative to Radar Sightings
Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.

2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL
1. Teletype sequences of local weather conditions.

2. Winds aloft report.

RESTRICTED

@ aestricten @

3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4, Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.

6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.

7, Obtain photographs (or original negatives) where available; if not, secure sketches of:
Object.
Surrounding terrain where observed.
Place where it contacted earth (if this happened).
Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).

Cc. P, CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

RESTRICTED

e RESTRICTED

RESTRICTED

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called “Flying Discs.”

b. To establish procedures for reporting such information,

2. RESCISSION

3. REPORTING
a. General

(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings,

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, “Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3,’’

RESTRICTED 9-892, AF

yey
2.
3.

RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

Major Air Commands (ZI)

(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned,

(4) Written reports will be submitted on AF Form 112.

(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.

Non-Air Force Agencies

(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand,

PART Il - REQUIREMENTS

General

Date of sighting.

Time of sighting (zonal by 24 hr. clock).

Where sighted (observer’s position):

Ground

(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.

Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

Type aircraft, speed, altitude, direction of flight.
Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)

4, Number of objects.

Formation type (if any), sketch if possible.

5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)

6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
Time in sight.
Appearance of object.
a, Color.
Shape, (Sketch if possible)
Apparent construction. (Of what material or substance)
Size.
(1) Estimated size,
(2) Size as it appeared from observer’s view. (Compared to known object)
Direction of flight.
Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.
a, Color of smoke.

+b, Length and width.

RESTRICTED

ec. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d, Showed thru cloud.
Lights,
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
Support
Wings.
Aerodynamic list of fuselage.
Vertical jet.
Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
Propulsion.
a. Propeller or jet.

b. Rotor,

ce. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).

da. Visible exhaust or jet openings.
Control ard stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.

(3) Location.

RESTRICTED

Air ducts.

a. Slots.

b. Duct openings.

Speed - M.P.H.

Sound,

a. Continuous whine or buzz.

b. Roar, whistle, whoosh.

ce. Intermittent.

Manner of disappearance,

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view.

Disappeared behind obstacle.

Relative to the Observer

Name of observer.
Address.

Occupation.

Place of business.

a. Employer or employee.
Pertinent hobbies.

a. Is observer amateur astronomer, pilot, engineer, etc.

b. Length of time engaged in hobby (experience).

Ability to determine:

a. Color.

b. Speed of moving objects.
c. Size at distance.
Reliability of observer.

a. Sources.

RESTRICTED

(1) Neighbors,
(2) Police Dept.
(8) FBI records.
(4) Employer.
8. Notes relative to observer on:

a. Sightings in general.

b. How attention was drawn to object(s).
(1) Sound,
(2) Motion.

(8) Glint of light.

c, Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.

9. Witnesses.
a. Addressees.
b. Occupation,
c, Reliability.

Comments of interrogator regarding the intelligence and character of person interrogated.

Relative to Radar Sightings

Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target Stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible,

If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL
Teletype sequences of local weather conditions.

Winds aloft report.

RESTRICTED

3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4, Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils,

6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.

7, Obtain photographs (or original negatives) where available; if not, secure sketches of:
a, Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d, Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).

Cc. P. CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

RESTRICTED

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C,

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘“‘Flying Dises,”

b. To establish procedures for reporting such information.
2. RESCISSION

Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 426.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.

38. REPORTING

a, General

(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

RESTRICTED 9-4892, AF

RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

Major Air Commands (ZI)

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.

(4) Written reports will be submitted on AF Form 112.

Non-Air Force Agencies

(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand,
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).

3. Where sighted (observer’s position):

a. Ground

(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.

(4) Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

Air

(1) Type aircraft, speed, altitude, direction of flight.

(2) Distance and direction from city, town or known landmark,
(8) Clock position of object from observer’s aircraft.

(4) Latitude and longitude.

Sea

(1) Latitude and longitude.

(2) Proximity to land. (Name city, country, etc.)

4, Number of objects.

Formation type (if any), sketch if possible.

5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)

6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon,
c. Altitude.
Time in sight.
Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
Apparent construction. (Of what material or substance)
Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
Direction of flight.
Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.
a. Color of smoke,

¥b. Length and width.

RESTRICTED

ec, Odor (if any),
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
Effect on clouds,
a. Opened path thru clouds.
b. Forced cloud or mists,
c. Reflected on cloud.
d. Showed thru cloud,
Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
Support
Wings.
Aerodynamic list of fuselage.
Vertical jet.
Rotating cylinder or cone,
e. Aerostatic lift (balloon or dirigible).
Propulsion,
a. Propeller or jet.

b. Rotor.

ce. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).

d, Visible exhaust or jet openings.
Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.

(3) Location.

RESTRICTED

Air ducts.

a. Slots.

b. Duct openings.

Speed - M.P.H.

Sound.

a. Continuous whine or buzz.

b. Roar, whistle, whoosh,

c. Intermittent.

Manner of disappearance.

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view.

Disappeared behind obstacle.

Relative to the Observer

Name of observer.
Address,

Occupation.

Place of business.

a. Employer or employee.
Pertinent hobbies,

a. Is observer amateur astronomer, pilot, engineer, etc.

b. Length of time engaged in hobby (experience).

Ability to determine:

a. Color,

b. Speed of moving objects.
c. Size at distance.
Reliability of observer.

a. Sources.

RESTRICTED

(1) Neighbors.
(2) Police Dept.
(3) FBI records,
(4) Employer.
8. Notes relative to observer on:

a. Sightings in general.

b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(8) Glint of light.

c, Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne,

9. Witnesses.
a, Addressees.
b. Occupation,

c. Reliability.

Comments of interrogator regarding the intelligence and character of person interrogated.

Relative to Radar Sightings

Re radars operating on ground,
a. Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible,

2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL
Teletype sequences of local weather conditions.

Winds aloft report.

RESTRICTED

8. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.

6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.

7, Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d, Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).

Cc. P. CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

RESTRICTED

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called “Flying Discs.”

b. To establish procedures for reporting such information,
2. RESCISSION

a. General

(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings,

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

RESTRICTED ¢9-4892, AF

RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.

Major Air Commands (ZI)

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.

(8) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.

(4) Written reports will be submitted on AF Form 112.

Non-Air Force Agencies

3. Where sighted (observer’s position):

a. Ground

(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(8) From building (story), yard, etc.

(4) Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.

Formation type (if any), sketch if possible.

5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)

6. Distance of object from observer.

a. Laterally or horizontally.

b. Angle of elevation from horizon.

c. Altitude.

Time in sight.

Appearance of object,

a. Color.

b. Shape. (Sketch if possible)
Apparent construction. (Of what material or substance)
Size.

(1) Estimated size.

(2) Size as it appeared from observer’s view. (Compared to known object)

Direction of flight.

Tactics or maneuvers.

Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.

a. Color of smoke.

yb. Length and width.

RESTRICTED

ce. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
Support
Wings.
Aerodynamic list of fuselage.
Vertical jet.
da. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
Propulsion.
a. Propeller or jet.

Rotor,

Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).

Visible exhaust or jet openings.
Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.

(3) Location.

RESTRICTED

Air ducts.

b. Duct openings.

Speed - M.P.H.

Sound.

a. Continuous whine or buzz.

b. Roar, whistle, whoosh.

c. Intermittent.

Manner of disappearance.

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view.

Disappeared behind obstacle.

Relative to the Observer

Name of observer.
Address.

Occupation.

Place of business.

a. Employer or employee.
Pertinent hobbies.

a. Is observer amateur astronomer, pilot, engineer, etc.

b. Length of time engaged in hobby (experience).

Ability to determine:

a. Color.

b. Speed of moving objects.
c. Size at distance.
Reliability of observer.

a. Sources.

RESTRICTED

(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:

a. Sightings in general.

b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.

ce. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.

9. Witnesses.
a. Addressees.
b. Occupation.

c. Reliability.

Comments of interrogator regarding the intelligence and character of person interrogated.

Relative to Radar Sightings

Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what angle (180°), ete. and what radius of turn,
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.

2, If airborne when object sighted.
a, Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL
Teletype sequences of local weather conditions.

Winds aloft report.

RESTRICTED

8. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5, If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.

6, If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.

7, Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d, Maneuvers.
e. Formation if objects were more than two.
8, Secure signed statement.
9, Obtain fragments or physical evidence where possible.

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).

Cc. P, CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

RESTRICTED

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”

b. To establish procedures for reporting such information.
2. RESCISSION

3. REPORTING

a. General

(1) As complete an answer to the requirements enunciated in Part Il, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force, Cables will contain the phase, “Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.’

RESTRICTED 94892, AF

RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

(83) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.

Major Air Commands (ZI)

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned,

(4) Written reports will be submitted on AF Form 112.

Non-Air Force Agencies

(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand,
PART Il - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).

3. Where sighted (observer’s position):

a. Ground

(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.

(4) Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

Type aircraft, speed, altitude, direction of flight.
Distance and direction from city, town or known landmark,
Clock position of object from observer’s aircraft.

Latitude and longitude.

Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.

5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)

6. Distance of object from observer.

a. Laterally or horizontally.

b. Angle of elevation from horizon.

c. Altitude.

Time in sight.

Appearance of object.

a. Color.

b. Shape, (Sketch if possible)
Apparent construction. (Of what material or substance)
Size.

(1) Estimated size.

(2) Size as it appeared from observer’s view. (Compared to known object)

Direction of flight.

Tactics or maneuvers.

Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.

a. Color of smoke.

’b. Length and width.

RESTRICTED

ce. Odor (if any).
d, Rate of evaporation.
e. Does trail vary with sound? (spurts)
Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d, Showed thru cloud.
Lights.
a, Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
Support
Wings.
Aerodynamic list of fuselage.
Vertical jet.
Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
Propulsion.
a. Propeller or jet.

b. Rotor.

c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).

d. Visible exhaust or jet openings.
Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.

(8) Location.

RESTRICTED

Air ducts.

a. Slots.

b. Duct openings.

Speed - M.P.H.

Sound.

a. Continuous whine or buzz.

b. Roar, whistle, whoosh.

ce. Intermittent.

Manner of disappearance.

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view,

Disappeared behind obstacle.

Relative to the Observer

Name of observer.
Address,

Occupation.

Place of business.

a. Employer or employee.
Pertinent hobbies.

a. Is observer amateur astronomer, pilot, engineer, etc.

b. Length of time engaged in hobby (experience).

Ability to determine:

a. Color,

b. Speed of moving objects.
c. Size at distance,
Reliability of observer.

a. Sources.

RESTRICTED

Neighbors.
Police Dept.
FBI records,
Employer.
Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion,
(3) Glint of light.

c. Degree of fatigue and duration of flight at time of sighting in cases where observer is

airborne,

Witnesses.

a, Addressees.
b. Occupation.

c, Reliability.

Comments of interrogator regarding the intelligence and character of person interrogated.

Relative to Radar Sightings

Re radars operating on ground.
a, Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what arigle (180°), etc. and what radius of turn.

If radius of turn is not observable, how long did the target stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach. Track

all if possible.

If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL

Teletype sequences of local weather conditions.

Winds aloft report.

RESTRICTED

3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.

6, If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.

7, Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
ce. Place where it contacted earth (if this happened).
d, Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).

Cc. P. CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

RESTRICTED

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”

b. To establish procedures for reporting such information,
2. RESCISSION

a. General

(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

RESTRICTED 09-4892, AF

RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

Major Air Commands (ZI)

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.

(4) Written reports will be submitted on AF Form 112.

Non-Air Force Agencies

3. Where sighted (observer’s position):

a. Ground

(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(8) From building (story), yard, etc.

(4) Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

Type aircraft, speed, altitude, direction of flight.
Distance and direction from city, town or known landmark.
Clock position of object from observer’s aircraft.
Latitude and longitude.

Sea

(1) Latitude and longitude.

(2) Proximity to land. (Name city, country, etc.)

4. Number of objects.

Formation type (if any), sketch if possible.

5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)

6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
Time in sight.
Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
Apparent construction. (Of what material or substance)
Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
Direction of flight.
Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.
a. Color of smoke.

yb. Length and width,

RESTRICTED

ec. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
Lights.
a. Reflected or attached.
b. Luminous
ce. Blinked on and off in relation to speed.
Support
Wings.
Aerodynamic list of fuselage.
Vertical jet.
Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
Propulsion.
a. Propeller or jet.

b. Rotor.

c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).

da. Visible exhaust or jet openings.
Control and stability.
a. Fins
b, Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.

(3) Location.

RESTRICTED

Air ducts.

a. Slots.

b. Duct openings.

Speed - M.P.H.

Sound.

a. Continuous whine or buzz.

b. Roar, whistle, whoosh.

c. Intermittent.

Manner of disappearance.

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view.

Disappeared behind obstacle.

Relative to the Observer

Name of observer.
Address.

Occupation.

Place of business.

a. Employer or employee.
Pertinent hobbies.

a. Is observer amateur astronomer, pilot, engineer, etc.

b. Length of time engaged in hobby (experience).

Ability to determine:

a. Color.

b. Speed of moving objects.
c. Size at distance.
Reliability of observe

a. Sources.

RESTRICTED

Neighbors.
Police Dept.
FBI records.
Employer.
8, Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.

(3) Glint of light.

ce. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.

9. Witnesses.
a, Addressees.
b. Occupation.
c. Reliability.

10. Comments of interrogator regarding the intelligence and character of person interrogated.

Relative to Radar Sightings

1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible,

2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL
Teletype seque! of local weather conditions.

Winds aloft report.

RESTRICTED

8. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.

6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.

7, Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
da, Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such),

Cc. P. CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

RESTRICTED

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”

b. To establish procedures for reporting such information.
2. RESCISSION

Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CS8GID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.

8, REPORTING

a, General

(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings,

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

RESTRICTED ¢9-4892, AF

RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

Major Air Commands (ZI)

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned,

(4) Written reports will be submitted on AF Form 112.

Non-Air Force Agencies

PART Il - REQUIREMENTS

General

Date of sighting.

2. Time of sighting (zonal by 24 hr. clock).

Where sighted (observer’s position):

Ground

City, town. ‘
(2) Distance and direction from city or town, road, intersection, etc.
(8) From building (story), yard, etc.

(4) Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

Type aircraft, speed, altitude, direction of flight.
Distance and direction from city, town or known landmark.
Clock position of object from observer’s aircraft.
Latitude and longitude.
Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)

4, Number of objects.

Formation type (if any), sketch if possible.

5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)

6. Distance of object from observer.
a, Laterally or horizontally.
b. Angle of elevation from horizon,
c, Altitude.
Time in sight.
Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
Apparent construction. (Of what material or substance)
Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
Direction of flight.
Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.
a. Color of smoke.

’b. Length and width.

RESTRICTED

ce. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound?
Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
da. Showed thru cloud.
Lights.
a, Reflected or attached.
b, Luminous
c, Blinked on and off in relation to speed.
Support
Wings.
Aerodynamic list of fuselage,
Vertical jet.
Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
Propulsion.
a. Propeller or jet.

b. Rotor.

c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).

d. Visible exhaust or jet openings.
Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
Size.
Shape.

Location.

RESTRICTED

Air ducts.

b. Duct openings.

Speed - M.P.H.

Sound.

a. Continuous whine or buzz.

b. Roar, whistle, whoosh.

c. Intermittent.

Manner of disappearance.

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view.

Disappeared behind obstacle.

Relative to the Observer

Name of observer.
Address.

Occupation.

Place of business.

a. Employer or employee.
Pertinent hobbies.

a. Is observer amateur astronomer, pilot, engineer, etc.

b. Length of time engaged in hobby (experience).

Ability to determine:

a. Color.

b. Speed of moving objects.
c. Size at distance.
Reliability of observer.

a. Sources.

RESTRICTED

Neighbors.
Police Dept.
FBI records.
Employer.
Notes relative to observer on:
a, Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.

ce. Degree of fatigue and duration of flight at time of sighting in cases where observer is

airborne,

Witnesses.
a. Addressees.
b. Occupation.

c. Reliability.

Comments of interrogator regarding the intelligence and character of person interrogated,

Relative to Radar Sightings

Re radars operating on ground,
a. Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what argle (180°), etc. and what radius of turn.

If radius of turn is not observable, how long did the target stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach, Track

all if possible,

If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL
Teletype sequences of local weather conditions.

Winds aloft report.

RESTRICTED

8. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4, Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.

6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.

7, Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed,
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9, Obtain fragments or physical evidence where possible.

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).

Cc. P. CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

RESTRICTED

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1, PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called “Flying Discs.’’

b. To establish procedures for reporting such information,
2. RESCISSION

3. REPORTING

a. General

(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings,

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

RESTRICTED 09-4892, AF

RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

Major Air Commands (ZI)

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned,

(4) Written reports will be submitted on AF Form 112.

Non-Air Force Agencies

3. Where sighted (observer’s position):

a. Ground

(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.

(4) Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

Formation type (if any), sketch if possible.

5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)

(1) Estimated size.

(2) Size as it appeared from observer’s view. (Compared to known object)

Direction of flight.

Tactics or maneuvers.

Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.

a. Color of smoke.

’b. Length and width.

RESTRICTED

c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
Effect on clouds.
a. Opened path thru clouds.
b, Forced cloud or mists.
c. Reflected on cloud.
da, Showed thru cloud.
Lights.
a. Reflected or attached.
b. Luminous
c., Blinked on and off in relation to speed.
Support
Wings.
Aerodynamic list of fuselage.
Vertical jet.
Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
Propulsion.
Propeller or jet.

Rotor.

Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).

Visible exhaust or jet openings.
Control and stability.

Fins

Stabilizers (horizontal or vertical).

(1) Size.

(2) Shape.

(8) Location.

RESTRICTED

Air ducts.

a. Slots.

b. Duct openings.

Speed - M.P.H.

Sound.

a. Continuous whine or buzz.

b. Roar, whistle, whoosh,

ce, Intermittent.

Manner of disappearance.

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view.

Disappeared behind obstacle.

Relative to the Observer

Name of observer.
Address.

Occupation.

Place of business.

a. Employer or employee.
Pertinent hobbies.

a. Is observer amateur astronomer, pilot, engineer, etc.

b. Length of time engaged in hobby (experience).

Ability to determine:

a. Color.

b. Speed of moving objects.
ec. Size at distance.
Reliability of observer.

a. Sources.

RESTRICTED

(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8, Notes relative to observer on:

a, Sightings in general.

b. How attention was drawn to object(s).
(1) Sound,
(2) Motion.
(3) Glint of light.

c, Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.

9. Witnesses,
a. Addressees.
b. Occupation.
c. Reliability.

Comments of interrogator regarding the intelligence and character of person interrogated.

Relative to Radar Sightings

Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible,

2, If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL

Teletype sequences of local weather conditions.

Winds aloft report.

RESTRICTED

8. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4, Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.

6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.

7, Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).

Cc. P. CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

RESTRICTED

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”

b. To establish procedures for reporting such information.
2. RESCISSION

8. REPORTING

a, General

(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

RESTRICTED 94892, AF

RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

Major Air Commands (ZI)

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned,

(4) Written reports will be submitted on AF Form 112.

Non-Air Force Agencies

PART II - REQUIREMENTS

General

1. Date of sighting.

2. Time of sighting (zonal by 24 hr. clock).

8. Where sighted (observer’s position):
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.

(4) Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

Type aircraft, speed, altitude, direction of flight.
Distance and direction from city, town or known landmark.
Clock position of object from observer’s aircraft.

Latitude and longitude.

Latitude and longitude.
Proximity to land. (Name city, country, etc.)
4, Number of objects.
Formation type (if any), sketch if possible.

5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)

6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
Time in sight.
Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
Apparent construction, (Of what material or substance)
Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
Direction of flight.
Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.
a, Color of smoke.

+b. Length and width.

RESTRICTED

Odor (if any).
Rate of evaporation.

Does trail vary with sound? (spurts)

Effect on clouds.

Opened path thru clouds.
Forced cloud or mists.
Reflected on cloud.

Showed thru cloud,

Lights.

a.
b,

Reflected or attached.
Luminous

Blinked on and off in relation to speed.

Support

Wings.

Aerodynamic list of fuselage.
Vertical jet.

Rotating cylinder or cone.

Aerostatic lift (balloon or dirigible).

Propulsion,

Propeller or jet.

Rotor.

Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).

Visible exhaust or jet openings.

Control and stability.

Fins

Stabilizers (horizontal or vertical).
(1) Size.

(2) Shape.

(8) ‘Location.

RESTRICTED

Air ducts.

a. Slots.

b. Duct openings.

Speed - M.P.H.

Sound.

a. Continuous whine or buzz.

b. Roar, whistle, whoosh.

c. Intermittent.

Manner of disappearance.

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view.

Disappeared behind obstacle.

Relative to the Observer

Name of observer.
Address.

Occupation.

Place of business.

a. Employer or employee.
Pertinent hobbies.

a. Is observer amateur astronomer, pilot, engineer, etc.

b. Length of time engaged in hobby (experience).

Ability to determine:

a. Color.

b. Speed of moving objects.
c. Size at distance.
Reliability of observer.

a. Sources.

RESTRICTED

(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:

a. Sightings in general.

b. How attention was drawn to object(s).
(1) Sound,
(2) Motion.
(3) Glint of light.

ce. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.

9, Witnesses.
a. Addressees.
b. Occupation.

ce. Reliability.

Comments of interrogator regarding the intelligence and character of person interrogated.

Relative to Radar Sightings

Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.

2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL
Teletype sequences of local weather conditions.

Winds aloft report.

RESTRICTED

8. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4, Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.

6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc,

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).

C0? Cateee_

Cc. P. CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

RESTRICTED

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”

b. To establish procedures for reporting such information.
2. RESCISSION

a. General

(1) As complete an answer to the requirements enunciated in Part Il, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

RESTRICTED 09-4892, AF

RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

Major Air Commands (ZI)

(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn; MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned,

(4) Written reports will be submitted on AF Form 112.

Non-Air Force Agencies

8. Where sighted (observer’s position):

a. Ground

(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(83) From building (story), yard, etc.

(4) Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

Type aircraft, speed, altitude, direction of flight.
Distance and direction from city, town or known landmark.
Clock position of object from observer’s aircraft.
Latitude and longitude.
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
Number of objects.
Formation type (if any), sketch if possible.

Observable celestial phenomena or planets that may account for the sighting. (Local facilities

or organizations which follow such celestial phenomena should be consulted for such information.)

Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
Time in sight.
Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
Apparent construction. (Of what material or substance)
Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
Direction of flight.
Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.
a. Color of smoke.

yb. Length and width.

RESTRICTED

Cc.

RESTRICTED

Odor (if any).
Rate of evaporation.

Does trail vary with sound? (spurts)

Effect on clouds.

a.
b.
Cc.

Opened path thru clouds.
Forced cloud or mists.
Reflected on cloud.

Showed thru cloud.

Lights,

a.
b,

Reflected or attached.
Luminous

Blinked on and off in relation to speed.

Support

Wings.

Aerodynamic list of fuselage.
Vertical jet.

Rotating cylinder or cone.

Aerostatic lift (balloon or dirigible).

Propulsion.

a.
b.
e.

Propeller or jet.

Rotor.

Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).

Visible exhaust or jet openings.

Control and stability.

Fins

Stabilizers (horizontal or vertical).
(1) Size.

(2) Shape.

(8) Location.

RESTRICTED

Air ducts.

a. Slots.

b. Duct openings.

Speed - M.P.H.

Sound.

a. Continuous whine or buzz.

b. Roar, whistle, whoosh.

c. Intermittent.

Manner of disappearance.

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view.

Disappeared behind obstacle.

Relative to the Observer

Name of observer.
Address.

Occupation.

Place of business.

a. Employer or employee.
Pertinent hobbies.

a. Is observer amateur astronomer, pilot, engineer, etc.

b. Length of time engaged in hobby (experience).

Ability to determine:

a. Color.

b. Speed of moving objects.
ce. Size at distance.
Reliability of observer.

a. Sources.

RESTRICTED

Neighbors.
Police Dept.
FBI records.
Employer.
8. Notes relative to observer on:
a, Sightings in general.
b. How attention was drawn to object(s).
(1) Sound,
(2) Motion,
(3) Glint of light.

c, Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.

9, Witnesses,
a. Addressees.
b. Occupation.
ec, Reliability.

Comments of interrogator regarding the intelligence and character of person interrogated.

Relative to Radar Sightings

Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn,
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible,

2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL

Teletype sequences of local weather conditions.

Winds aloft report.

RESTRICTED

8. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.

6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.

7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a, Object.
b. Surrounding terrain where observed.
ce, Place where it contacted earth (if this happened).
d, Maneuvers.
e, Formation if objects were more than two.
8. Secure signed statement.
9, Obtain fragments or physical evidence where possible.

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).

C0? Cateee_

Cc, P, CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

RESTRICTED

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”

b. To establish procedures for reporting such information.
2. RESCISSION

3, REPORTING

a. General

(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings,

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

RESTRICTED C9-4892, AF

i
2.
3.

RESTRICTED

(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

Major Air Commands (ZI)

(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.

(4) Written reports will be submitted on AF Form 112.

Non-Air Force Agencies

PART II - REQUIREMENTS

General

Date of sighting.

Time of sighting (zonal by 24 hr. clock).

Where sighted (observer’s position):

Ground

City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(8) From building (story), yard, etc.

Map coordinates (if feasible) showing latitude and longitude.

RESTRICTED

Type aircraft, speed, altitude, direction of flight.
Distance and direction from city, town or known landmark.
(3) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4, Number of objects.

Formation type (if any), sketch if possible.

5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)

6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.

Time in sight.

Appearance of object.

a. Color.
b. Shape. (Sketch if possible)
Apparent construction. (Of what material or substance)
Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
Direction of flight.
Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
Evidence of exhaust.
a. Color of smoke.

+b. Length and width.

RESTRICTED

ce. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
Lights.
a, Reflected or attached.
b, Luminous
c, Blinked on and off in relation to speed.
Support
Wings.
Aerodynamic list of fuselage.
Vertical jet.

Rotating cylinder or cone.

e. Aerostatic lift (balloon or dirigible).

Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.

(8) Location.

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Air ducts.

a, Slots.

b. Duct openings.

Speed - M.P.H.

Sound.

a. Continuous whine or buzz.

b. Roar, whistle, whoosh,

ce. Intermittent.

Manner of disappearance.

a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
Faded from view.

Disappeared behind obstacle.

Relative to the Observer

Name of observer.
Address.

Occupation.

Place of business.

a. Employer or employee.
Pertinent hobbies.

a. Is observer amateur astronomer, pilot, engineer, etc.

b. Length of time engaged in hobby (experience).

Ability to determine:

a. Color.

b. Speed of moving objects.
ce. Size at distance.
Reliability of observer.

a. Sources.

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(1) Neighbors.
(2) Police Dept.
(83) FBI records.
(4) Employer.
Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound,
(2) Motion.
(3) Glint of light.

ce. Degree of fatigue and duration of flight at time of sighting in cases where observer is

airborne.

Witnesses,
a. Addressees.
b. Occupation.

¢. Reliability.

Comments of interrogator regarding the intelligence and character of person interrogated.

Relative to Radar Sightings

Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.

b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.

Tf radius of turn is not observable, how long did the target stay in the turn and what was its speed?

c. Note particularly any separation of distant target into several targets upon approach. Track

all if possible.

If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?

b. Give estimates of size, speed, maneuvers, etc.

GENERAL
Teletype sequences of local weather conditions.

Winds aloft report.

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8. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)

4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.

5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.

6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.

7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d, Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9, Obtain fragments or physical evidence where possible.

10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).

Cc. P. CABELL

Major General, USAF

Director of Intelligence, Office of
Deputy Chief of Staff, Operations

DISTRIBUTION:

Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches

Director of Central Intelligence

Special Assistant for Research and Intelligence,
Department of State

Director of Intelligence, GSUSA

Chief of Naval Intelligence

Commandant (INT), United States Coast Guard

Director, Federal Bureau of Investigation

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DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.

15 February 1949

AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4

UNCONVENTIONAL AIRCRAFT

PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:

a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called “Flying Discs.”

b. To establish procedures for reporting such information.
2. RESCISSION

3. REPORTING

a, General

(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings,

(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.

Major Air Commands (Overseas) and Air Attaches

RESTRICTED (09-4892, AF

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(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.

Major Air Commands (ZI)

[…truncated…]

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