Report of Unusual Flying Objects — Chicago, Illinois, 28 July 1952

This Air Intelligence Information Report, dated August 1, 1952, documents a sighting of ten disc-shaped objects reported by a civilian woman in Chicago, Illinois. The incident occurred on July 28, 1952, at approximately 2045 CST. According to the report, the witness observed the objects, described as blue-green and flat, traveling at a high rate of speed in a straight line before making an abrupt 30-degree turn. The observation lasted for approximately fifteen minutes. The report notes that the 755th AC&W Squadron at Williams Bay, Wisconsin, had the AN/GPS 6-3 radar system in operation at the time, but recorded no electronic sightings. Furthermore, there were no visual sightings reported by Ground Observer Corps (GOC) or Anti-Aircraft Artillery (AAA) observers. Weather conditions at the time were described as having low scattered clouds and high thin broken cirrus, with visibility of fifteen miles and no restrictions to vision. Captain Frank J. Radzuikinas, the Intelligence Officer who authored the report, contacted the Yerkes Observatory on July 30, 1952, to investigate the possibility of an astronomical explanation, but the inquiry yielded negative results. The document is classified as Restricted and was distributed to various military commands, including the Air Materiel Command at Wright-Patterson AFB, the Air Defense Command at Ent AFB, the 30th Air Division, and the Director of Intelligence at Hq, USAF.