UNIDENTIFIED AERIAL OBJECTS: Fireball Sighted at Los Alamos, New Mexico, at 1555 hours, 25 February 1950

This document is a formal Report of Investigation issued by the 17th District Office of Special Investigations (OSI) of the United States Air Force, dated 15 March 1950. It concerns a sighting of an unidentified aerial object over Los Alamos, New Mexico, on 25 February 1950. The report details an incident occurring between 1545 and 1555 hours, involving observations made by Atomic Energy Security Service inspectors. The witnesses reported seeing a single object that appeared circular or shaped like a plane fuselage, tapered at both ends. The object was described as silver and flashing, with a size ranging from unknown to that of a small airplane. Its flight behavior was noted as erratic, characterized by fluttering, wobbling, or oscillating motions, and it appeared capable of changing course, slowing down, and accelerating. The object emerged from clouds and headed toward the ground, remaining in sight for a duration ranging from three seconds to two minutes. The investigation was initiated following standard procedures established by AFCSI Letter No. 85, dated 12 August 1949. The report was prepared by Special Agent Cristino B. Griego and approved by District Commander Lt. Col. Doyle Rees. The document notes that the investigation into this and similar phenomena was ongoing at the time, with copies of the report distributed to the Air Materiel Command at Wright-Patterson Air Force Base and the Air Force Cambridge Research Laboratory. The file was marked as closed, with the investigator stating that all logical leads had been exhausted.