Special Report No. 14: Analysis of Reports of Unidentified Aerial Objects

Special Report No. 14, dated May 5, 1955, provides a comprehensive statistical analysis of reports of unidentified aerial objects (UAPs) collected by the U.S. Air Force between 1947 and 1952. Initiated under Project No. 10073, the study aimed to determine if reported sightings represented unknown technological developments. The archive contains approximately 4,000 reports, which were processed using IBM punched-card systems to facilitate statistical evaluation. The report details the methodology used to standardize and code subjective observer data, including the development of specific questionnaire forms and work sheets. The analysis categorized sightings into various groups, including balloons, astronomical phenomena, aircraft, and 'unknowns.' A significant portion of the report is dedicated to frequency and percentage distributions of sighting characteristics such as color, speed, shape, and duration. The study concludes that there is no evidence that unidentified aerial objects pose a physical threat to U.S. security. Statistical tests, including Chi Square analyses, were applied to compare 'known' and 'unknown' sightings, revealing that while some differences existed, they did not confirm the existence of a distinct class of 'flying saucers.' The report emphasizes the lack of physical evidence and suggests that many 'unknown' reports likely stem from misinterpretations of common objects or natural phenomena, exacerbated by the psychological tendency of observers to be captivated by the mysterious. The document includes extensive appendices with detailed tabulations and the specific working papers used during the project.