Project 10073 Record Cards and Related Correspondence — July 1958

This document collection consists of Project 10073 record cards and supporting memoranda from July 1958, detailing investigations into UFO sightings in France and the United States. The primary focus of the correspondence is the identification of reported aerial phenomena as man-made satellites or weather balloons. A sighting on 11 July 1958 in Northeast France, involving four military observers at Etain Air Base, described an egg-shaped, white, grapefruit-sized object traveling from SSW to NE. This was subsequently confirmed by Captain G. Miatech of the Astronautics Branch as the Sputnik III rocket, which calculations placed in the vicinity at the time of the observation. A second report from 12 July 1958, originating from near Buffalo, Wyoming, described a stationary, parachute or balloon-like object. This was also evaluated as a balloon, with investigators noting that the description provided by the witnesses was consistent with such an object. The documents include technical data, such as wind velocity charts and altitude reports, used by the Air Force to verify these identifications. The correspondence highlights the Air Force's systematic approach to filtering UFO reports by cross-referencing them with known satellite orbital tracks and weather balloon release schedules. The records reflect a period of high sensitivity to unidentified objects, where the Air Force sought to distinguish between potential security threats and known aerospace activities, such as the Soviet Sputnik program.