May 1961 Sightings Log

This document is a comprehensive, multi-page log detailing unidentified aerial phenomena (UAP) sightings reported during the month of May 1961. The log is structured as a table, recording the date of each incident, the geographic location (including cities, states, and occasionally specific military installations or coordinates), the reporting source—categorized primarily as 'Military' or 'Civilian'—and the final evaluation of the sighting. The evaluations provided in the log indicate that the vast majority of these reports were resolved as conventional phenomena. Common explanations include 'Astro' (referring to astronomical bodies such as Venus, stars, or meteors), 'Balloon' (often specifically referencing Echo I satellites), or 'Insufficient Data' for cases where the information provided was too sparse to reach a definitive conclusion. Several entries are marked as 'Unidentified' or note the presence of 'A/C' (aircraft). The document serves as a historical record of the investigative process used by the Air Force to track and categorize reports of aerial anomalies during this period. It highlights the high volume of reports that were ultimately attributed to natural or man-made objects, reflecting the standard operating procedures for handling UAP inquiries at the time.