“Document for December 3rd:
Message from Commander, Air Technical Information Center to Commander, Air Defense Command reporting the sighting of an unidentified flying object”
(National Archives and Records Administration, Washington, D.C.)
This message dated 3 December 1957, references the sighting of a large, flat, silver coloured UFO by the pilot of U.S. Air Force F-86 jet fighter in the skies near Joliet, Illinois, on 27 November 1957:
http://www.archives.gov/historical-docs/todays-doc/index.html?dod-date=1203
Satellite photo of Joliet, Illinois (tageo.com)
(tageo.com photo)