UFO Observation Report — Denver, Colorado, October 31, 1967

This document details the investigation of a UFO sighting reported in Denver, Colorado, on October 31, 1967. The observer, a 20-year-old male, reported seeing two very bright lights with red, green, and blue lights around the edge of an object, accompanied by a humming noise, while located near the Denver Federal Center. The observation lasted approximately two minutes. The Air Force's Aerial Phenomena Office, led by Major Hector Quintanilla, Jr., initiated an investigation, which included inquiries to local aviation authorities, including Stapleton International Airport and Skip-Craft Aviation, Inc., to determine if any aircraft or aerial advertisers were in the area at the time. Responses from these entities indicated no unusual activity or aerial advertising. The observer was requested to complete an AF Form 117 to provide further details but failed to do so. Dr. J. Allen Hynek, acting as a consultant, reviewed the case and strongly recommended that the evaluation be changed from 'Possible (AIRCRAFT)' to 'Insufficient Information,' citing the lack of data, the fact that it was a one-witness report, and the perceived unreliability of the observer's description. The document also includes correspondence regarding other sightings in the same period, such as an Army exercise near Washington, D.C., and a list of sightings from November 1-11, 1967, which were largely categorized as insufficient data, aircraft, or astronomical phenomena.