Project 10073 Record Card — Denver, Colorado, 31 December 1956

This document is a collection of records and reports concerning Unidentified Aerial Phenomena (UAP) sightings occurring in late 1956 and early 1957. The primary document is a Project 10073 Record Card detailing a sighting in Denver, Colorado, on December 31, 1956. The witness, a student at the 3421st Student Squadron at Lowery Air Force Base, observed two round objects—one white and bright, the other dark—positioned in the upper right. The objects were observed for two hours and twenty-five minutes using binoculars and a telescope. The witness initially believed the objects were aircraft. The official conclusion recorded on the card suggests an astronomical origin, yet the case was classified as having insufficient data due to the failure to receive the photographs mentioned by the witness. The document also includes a teletype message (RJEDEN 75) confirming the details of this Denver sighting and noting that negatives were sent for development. Beyond the Denver incident, the archive contains several other reports of UAP sightings from across the United States, including Washington Heights, New York; San Luis Obispo, California; Baltimore, Maryland; Stow, Ohio; and Patrick Air Force Base, Florida. These reports describe a variety of phenomena, ranging from 'fiery' objects and 'cigar-shaped' craft to 'saucer-type ships' and 'blue-green blobs.' Many of these reports include witness descriptions of movement, such as hovering, rapid acceleration, and sudden disappearance. The document also provides a summary list of sightings from January 1957, categorizing them by location and evaluation, with many labeled as 'Astro' (meteor or star), 'Aircraft,' or 'Insufficient Data.' The compilation serves as an administrative record of the Air Technical Intelligence Center's (ATIC) efforts to track and evaluate these reports during the mid-1950s.