George AFB, CaliforniaMay 1952

On May 9, 1952, military personnel at George Air Force Base in California observed an unusual object in the sky. A round, silver object was spotted both by ground observers and by pilots in two F-86 fighter aircraft. The object appeared to have no trail, exhaust, or sound. An attempt at interception was broken off when the F-86 pilots ran low on fuel and could not close with the object.

The same day brought additional sightings. At 12:30 p.m., two silver objects with dark centers were seen moving slowly with the wind or breeze. They gave off a bright glare when the light struck them at certain angles. A third sighting occurred at 5:20 p.m., when an object described as dull in color and shaped like an arrowhead was observed. It appeared to have no aerodynamic features and disappeared over the horizon to the south.

Over the following two weeks, George Air Force Base experienced a series of sightings. On May 11, an object resembling a white paper plate flipping end over end was observed, along with two smaller objects flying in formation. Another object on May 13 appeared round and shiny, metallic in color. On May 14, the same observers reported a similar object. On May 20, a silver, round, bright object hovered before moving and fading away.

When Air Force investigators arrived to look into the sightings, they worked with ground observers and pilots in a T-6 aircraft to set up a coordinated observation effort. On May 22, contact was made with Edwards Air Force Base, which reported that a weather balloon (a rawinsonde, used to measure atmospheric conditions) had burst at 75,000 to 80,000 feet southeast of their station around the same time as one of the sightings. The Air Force concluded that at least some of the objects, particularly those on May 13 and May 20, were likely balloons released from Edwards. Other sightings, however, could not be conclusively explained. The file does not provide a final overall conclusion for all the incidents, though the primary case evaluation on the cover sheet lists the May 9 morning sighting as "unidentified."

The full case file is reproduced below as held by the National Archives across 62 pages.