PROJECT 10073 RECORD CARD — Vicinity Cheyenne, Wyoming, 12 May 1958

This document collection details a UFO sighting report from 12 May 1958 in the vicinity of Cheyenne, Wyoming. A civilian observer reported seeing an egg-shaped, white or silver object exhibiting a tumbling flight pattern for approximately 30 minutes. The report was processed through military channels, including the Air Technical Intelligence Center (ATIC) and the Air Force Command at Lowry Air Force Base. The investigation involved multiple communications between military units to verify the nature of the sighting. Major Kelly, stationed at the location referred to as 'CYS', verified the report, concluding that the object was a jet aircraft performing acrobatics. The documentation highlights administrative confusion regarding the abbreviation 'CYS AFB', which was not listed in the Standard USAF Index at the time. Correspondence between AFCIN-4E4 and Lowry AFB indicates that the military sought to clarify the location of the observers, eventually suggesting that 'CYS' referred to Francis E. Warren Air Force Base in Wyoming. The final assessment of the sighting was that it was an identified jet aircraft, effectively closing the case as a non-anomalous event.