Compilation of Unidentified Aerial Phenomena Reports — Los Alamos, New Mexico, October-November 1949

This document is a compilation of reports and investigations regarding Unidentified Aerial Phenomena (UAP) occurring between October and November 1949. The file centers on reports originating from the Los Alamos Atomic Energy installation and other locations, including Michigan and Japan. The reports are diverse, ranging from civilian accounts to observations by military personnel. One notable report from P.H. Garrett describes a metallic, wingless object seen on October 1, 1949, which he initially feared reporting due to potential public ridicule. Another report from a 1st Lieutenant at Sandia Base details a round, yellow-to-green object that performed a straight vertical drop before disappearing behind the Sandia Mountains. The document also includes official correspondence from the Atomic Energy Commission to the 17th District Office of Special Investigations (OSI), documenting sightings by scientists at Los Alamos. These accounts describe objects ranging from 'bluish-green lights' to 'flat circular plates' that exhibited erratic maneuvers, such as flipping or sudden changes in direction. The investigating officers, including Captain Cowan S. Hill, Jr., often expressed skepticism regarding the accuracy of these reports, citing the observers' locations on busy highways or the potential for misidentification of natural phenomena. The document highlights the military's attempt to standardize the reporting of these 'Flying Discs' in compliance with earlier directives. Despite the detailed descriptions provided by witnesses—including estimates of speed, size, and color—the official stance remained cautious, with investigators frequently noting the high probability of error in the observations. The file serves as a record of the early, systematic efforts by the United States Air Force and the Atomic Energy Commission to collect and evaluate UAP data during a period of heightened public and government interest in the subject.