Project 10073 Record Cards and Related Correspondence — Pueblo, Colorado, May 1956

This document collection contains Project 10073 record cards and associated teletype communications regarding a series of unidentified aerial phenomena sightings in Pueblo, Colorado, during May 1956. The initial reports, occurring between May 1 and May 7, 1956, involved sightings by civilians and the Ground Observer Corps of one or two round, white, fluorescent objects described as moving very fast. These objects were estimated to be the size of a baseball to a grapefruit. Intelligence Sergeant Gilbert Neison of the 4602d Air Intelligence Service Squadron was dispatched to investigate these reports. His findings suggested that the objects were dull, fluorescent, and mostly triangular in shape, though some were round. The sightings were reported to last between four seconds and one minute. The official conclusion for these early May incidents was that there was insufficient data for a definitive evaluation, with some speculation that searchlights may have contributed to the reports. A subsequent report dated May 18, 1956, details a sighting at the Pueblo Ordinance Depot. In this instance, guards observed a single, stationary, transparent object shaped like an inverted bowling pin, estimated to be 50 to 80 feet in size. This specific incident was investigated by SSGT Serudder of the 4602d AISS, who determined through a routine check of local agencies that the object was a weather balloon, identified as balloon number S262, which had been released from Vernallis, California. The documents include various teletype messages confirming these investigations and the administrative handling of the reports under Air Force regulations.