Project 10073 Record Card — De Borgia, Montana, 17 August 1952

On the morning of August 17, 1952, at approximately 10:35 AM Mountain Time, a witness and his family observed an unidentified aerial object near De Borgia, Montana. The witness, a construction engineer and member of the Ground Observer Corps (GOC), was at GOC Observation Post 32 when he heard a low, powerful humming sound, which he described as resembling a large electric motor being switched on. Upon looking for the source of the sound, he observed a silver, oval-shaped object hovering at an estimated altitude of 1,000 feet. The witness reported that the object quivered while stationary and appeared to be approximately half the size of a conventional aircraft. He noted that the object lacked any visible fuselage, propellers, or protrusions. After hovering, the object began to move, eventually departing to the south in a vertical arc at what the witness described as 'very great speed.' The witness, who was considered reliable by the reporting agency, stated that the object was observed with the naked eye under clear, warm weather conditions with no wind. The observation lasted between five and seven minutes. The witness explicitly noted that the object had no exhaust or trail. The incident was documented on a Project 10073 record card and subsequently reported via teletype to the Air Technical Intelligence Center at Wright-Patterson Air Force Base. The report emphasizes the witness's careful observation and his impression of the object's apparent power, noting that the humming sound was distinct and audible even on a quiet Sunday morning. The documentation includes sketches provided by the witness illustrating the object's shape, its quivering motion, and its flight path, as well as a detailed questionnaire regarding the sighting conditions.