PROJECT 10073 RECORD CARD: Sighting Incident 10 March 1951

This document consists of a Project 10073 record card and associated intelligence cables detailing an unidentified aerial phenomenon sighting on March 10, 1951, near Chinnampo, Korea. At approximately 0051Z, nine crew members aboard a B-29 aircraft observed a brilliant flash of light. The object was described as being roughly the size of a basketball, exhibiting a reddish-yellow glow that transitioned into a bluish-white or blue-green brilliance. The object appeared to move slightly downward and to the rear of the aircraft in a straight line before vanishing. The duration of the sighting was estimated at one second. The crew, who were familiar with the appearance of heavy flak at night, explicitly stated that the phenomenon did not resemble standard anti-aircraft fire. No sound or concussion was associated with the event, and no radar contact was reported. The official conclusion recorded on the card is that the case remains 'UNIDENTIFIED,' with the note that there was insufficient data to definitively categorize the object as flak, a flare, or a meteor. The document includes internal military communications between HQ USAF and the Air Technical Intelligence Center (ATIC) regarding the incident, emphasizing the lack of consensus among the crew regarding the nature of the object, though all agreed it was a very short-lived, bright event.