Project 10073 Record — Calumet City, Illinois, 15 August 1965

On 15 August 1965, at 0725Z, a civilian witness observed an unidentified aerial object near the Calumet City Expressway in Illinois. The witness, a 21-year-old male, reported seeing a single, dark grey, saucer-shaped object with a dome on top. The object was described as being far brighter than any star in the sky and featured two flashing lights—one yellow and one green—which were positioned in the front as the object moved in a southerly direction. The witness estimated the object's size to be comparable to a cigarette lighter held at arm's length. The object traveled from the North to the South, passing overhead from the observer's rear right before disappearing beyond some trees. The entire sighting lasted approximately five minutes. The witness reported no sound, no tail or exhaust, and no physical evidence. Weather conditions at the time were clear with a visibility of 10 miles. The report was processed by the 928th Troop Carrier Group, Medium (Reserve) at O'Hare International Airport. Arthur N. Shawron, an Assistant Base Flight Officer, prepared the final record. The official conclusion noted that while the characteristics of an aircraft observation were present, there was no data to definitively rule out an aircraft, leading to an 'undetermined' classification.