Project 10073 Records and Related Correspondence — Colorado Springs, October 1966

This document collection contains a series of Project 10073 records and related military correspondence regarding Unidentified Aerial Phenomena (UAP) sightings reported in the vicinity of Colorado Springs, Colorado, during October 1966. The records detail three distinct sighting events. The first, occurring on 2 October 1966, involved a civilian witness who observed a round, silver-gray, mushroom-shaped object for approximately one hour. The object appeared to have 'things shooting from it.' Investigating officers noted the presence of a full moon at the time, and the case was ultimately classified as having insufficient data for evaluation. A second event on 4 October 1966 involved a witness using a 250X telescope to observe an oval-shaped object that changed color from red to white and moved across the sky before dropping below the horizon. This sighting was officially attributed to the ECHO II satellite. A third report from 18 October 1966 was also deemed to have insufficient data, leading Major Hector Quintanilla, Jr., Chief of Project Blue Book, to send a formal letter to the witness requesting further information via FTD Form 164. The documents include standard military message forms (Joint Messageform) and official Project 10073 record sheets, reflecting the administrative process of the Air Force's investigation into these reports.