Record 066 · August 1949
Project Grudge Technical Report (UNIDENTIFIED FLYING OBJECTS)
U.S. Air Force · United States
Ledger illustration of the record — not a scan of the original paper. — Night Ledger illustration of the file
The report reviews individual cases, meteorological data, astronomical observations, and technical analyses. It determines that the majority of incidents (approximately 75% in related earlier assessments) had conventional explanations such as balloons, aircraft, meteors, or hoaxes. A small percentage remained unidentified due to insufficient data rather than exotic origins. No physical evidence of recovered craft, occupants, or biologics is mentioned or supported. The authors note that continued publicity could fuel unnecessary public concern and advise scaling back dedicated UFO investigations while maintaining basic reporting channels.
Public file: U.S. Air Force / NICAP Archive
