Project Blue Book Roll 90: Inspector General, USAF Office of Special Investigations District Files 1949-1967

This document is a microfilm publication (T1206, Roll 90) from the National Archives, containing District Files from the Inspector General, USAF Office of Special Investigations (OSI) covering the years 1949 to 1967. The content consists of a compilation of Spot Intelligence Reports, correspondence, and investigative summaries regarding Unidentified Flying Objects (UFOs) and unconventional aircraft sightings across the United States. The reports detail various incidents, including sightings in Drexel Hill, Pennsylvania; Camden, New Jersey; Huntington, West Virginia; and Rochester, Pennsylvania. The documents reflect the military's systematic, albeit often skeptical, approach to investigating these reports, frequently involving coordination with the Federal Bureau of Investigation (FBI), the Atomic Energy Commission (AEC), and local weather bureaus to rule out meteorological phenomena, weather balloons, or conventional aircraft. Several reports highlight the recurring nature of these sightings and the military's concern regarding potential security implications, particularly near sensitive installations like Oak Ridge, Tennessee. The archive also includes correspondence regarding the declassification of UFO reports and the involvement of academic institutions, such as the University of Colorado, in studying the phenomenon. The reports are characterized by a formal, bureaucratic tone, emphasizing the collection of data, the assessment of witness reliability, and the determination of whether sightings warranted further military or intelligence action.