George AFB, CaliforniaAugust 1952

On August 11, 1952, two military pilots at George Air Force Base in California reported seeing unidentified flying objects. Both sightings took place on the same morning but under very different circumstances, and both left Air Force investigators without a clear explanation.

The first sighting happened at 10:45 a.m. (1045 hours) when First Lieutenant William F. Van Steenburgh was driving southeast on Main Street near the base. He noticed a round, bright, and shiny object high in the sky, roughly 20,000 feet above ground level. The object appeared to hover over the San Bernardino Mountain Range about 25 miles away. Van Steenburgh had 12 years of military service and was considered reliable by his superiors. He watched the object for about three or four minutes before it disappeared while he was trying to find a better spot to observe it. The object showed no visible exhaust, vapor trail, or signs of propulsion.

About two hours later, at 8:01 a.m. (0801 hours), Colonel Amos F. Riha, the commanding officer of the 146th Fighter-Bomber Group, was flying an F-51 aircraft at 6,000 feet when he spotted a similar bright and shiny object. The colonel was leading a flight of three aircraft in formation. The object appeared roughly 10 to 15 miles away at a higher altitude of 15,000 to 20,000 feet. Like the morning sighting, it showed no exhaust or means of propulsion and seemed to hover or climb very slightly. Colonel Riha saw the object for about one minute before losing sight of it during a turn. He climbed his aircraft to 14,000 feet and led his flight to the last known location, but nothing more was observed. Several other F-51s were in the area that morning.

The weather on both occasions was clear with excellent visibility. Winds were light. Air Force investigators found no meteorological conditions, balloon launches, or other aircraft activity that could explain either sighting. The file records that no physical evidence was collected and no interception or contact with the unknown objects was attempted or achieved.

The Air Force evaluated the case as unidentified, meaning the sightings could not be explained by any known aircraft, balloon, or atmospheric phenomenon.

The full case file is reproduced below as held by the National Archives, spanning 10 pages.