Project 10073 Record Cards and Correspondence — Muskallonge Lake, Michigan, August 1963

This document contains records and correspondence related to two UAP sightings reported by a civilian and his brother-in-law near Muskallonge Lake, Michigan, in August 1963. The first sighting occurred on August 7, 1963, at 20:15 local time. The witness described an object appearing as a light, twice as bright as the Echo satellite, moving from the southwest to the northeast at an estimated altitude of 30,000 to 40,000 feet. The witness noted a 'pendulum type' swinging motion for approximately 10 seconds before the object assumed a straight course and faded from view. The second sighting occurred on August 9, 1963, at 20:40 local time. The witness described a solid, triangular-shaped object with a dark center and illuminated yellow outer edges, emitting a vapor trail that came to a distinct point, giving the object a diamond-shaped effect. This object was also estimated to be at 30,000 to 40,000 feet and was observed descending to the southeast. The witness reported the speed to be comparable to a large jet plane. The Air Force investigated these reports under Project 10073 (Project Blue Book). The official conclusion for both sightings was that they were aircraft, with the second sighting potentially involving a jet with an afterburner engaged. The file includes correspondence from Major Maston M. Jacks of the Air Force Office of Information, dated September 16, 1963, acknowledging the reports and providing the witnesses with questionnaires (Form FTD 164) for further documentation.