65 HS1-834228961 62-HQ-83894 Serial 164

This FBI file serial from case 62-HQ-83894 holds several copies of Air Intelligence Requirements Memorandum Number 4, "Unconventional Aircraft." Major General C. P. Cabell, Director of Intelligence at Headquarters United States Air Force, issued the memorandum on 15 February 1949. It sets continuing Air Force requirements for information on unidentified flying objects, including "Flying Discs," and tells commands to send reports to Air Materiel Command at Wright-Patterson AFB. It also includes a detailed checklist covering sighting details, observers, radar data and physical evidence, and the FBI Director appears on its distribution list.

From the source: Release of 2026-05-08 Incident: N/A, N/A. 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.

RESTRIC:t'ED
b. Air
(1) Type aircraft, speed, altltude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc .)
4. Number of objects.
Formation type (l.f any), sketch l.f possible.
5. Observable celestial phenomena or planets that may account for the slghtlng. (Local fac111t!.es
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.
7. Time in sight.
8. Appearance of object.
a . Color.
b. Shape. (Sketch ti possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as Lt appeared from observer's view. (Compared to known object)
Q. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, osctllatlng, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
, b. Length and width.
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