December 3, 1957 - Just an “unidentified aircraft” or was it a “UFO?” Message from Commander, Air Technical Information Center to Commander, Air Defense Command reporting the sighting of an unidentified flying object with sketch of location, 12/03/1957; Project Bluebook #5415; Records of Headquarters U.S. Air Force (Air Staff); Record Group 341; From the records of the Air Force’s “Project BLUE BOOK,” this message dated December 3, 1957, references the sighting of an “unidentified aircraft” by the pilot of an Air Force F-86 in the skies over Joliet, Illinois on November 27. From 1947 to 1969, a total of 12, 618 sightings were reported to Project BLUE BOOK. Of these 701 remain “Unidentified.”
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December 3, 1957 - Just an “unidentified aircraft” or was it a “UFO?”

Message from Commander, Air Technical Information Center to Commander, Air Defense Command reporting the sighting of an unidentified flying object with sketch of location, 12/03/1957; Project Bluebook #5415; Records of Headquarters U.S. Air Force (Air Staff); Record Group 341;

From the records of the Air Force’s “Project BLUE BOOK,” this message dated December 3, 1957, references the sighting of an “unidentified aircraft” by the pilot of an Air Force F-86 in the skies over Joliet, Illinois on November 27. From 1947 to 1969, a total of 12, 618 sightings were reported to Project BLUE BOOK. Of these 701 remain “Unidentified.”

Source: archives.gov