Osan AFB, Korea, September 1961September 1961

On the night of September 14, 1961, two U.S. Air Force Office of Special Investigations agents stationed at Osan Air Base in Korea reported seeing an unusual object in the sky. The men, Special Agents John Q. Hyde and Bill H. Hayes, were experienced observers trained in intelligence work. They watched the object for 12 minutes starting around 1048Z (10:48 a.m. Zulu time, or early evening local time).

The object appeared as a round shape, white in color but changing to red as it moved across the sky. The witnesses first spotted it near the moon, at an elevation of about 30 degrees and 270 degrees azimuth (looking roughly west). As it moved, the object's brightness increased. It traveled in an irregular path, changing speed and direction without following a straight line. At one point it hovered nearly stationary for two to three minutes while remaining white and constant in brightness. When a jet fighter approached the base at low altitude, the object began moving forward again, changed direction sharply, and continued toward the southeast. Near the end of the sighting, the light became as small as a star but far brighter. The object then disappeared with a sudden burst of speed while climbing upward.

The Air Force investigation found no radar tracks of any unknown objects in the area. Weather conditions showed broken clouds near the moon but clear skies along the object's path. A weather balloon had been released that morning, and an F-102 jet was operating in the vicinity with afterburner capability. The investigating officer concluded the sighting was probably caused by a jet aircraft maneuvering with its afterburner engaged. The changing colors could be explained by the aircraft's anti-collision lights and afterburner as it moved through the haze and smoke in the area. The apparent high speed and lack of sound might result from observer error, altitude, wind direction, and the presence of other aircraft noise. No evidence suggested the object posed a threat to national security.

A second sighting was also reported on August 27, 1961, by two radio station employees, A2C Aubrey F. Gholston and another airman. They observed a round, white or cream-colored object moving erratically with sharp vertical and right-angle movements for about 15 minutes. The object hovered briefly, then faded as it climbed through clouds. The witnesses ruled out a balloon based on their prior observations of weather balloons and said the maneuvers were too sharp for any known aircraft. However, OCR degradation makes some details of this second case difficult to read with certainty in the file.

The Air Force's final assessment marked the case as "probably balloon" on its record card, though the detailed investigation notes suggest the more likely explanation was a maneuvering jet aircraft. No definitive conclusion appears in the file as to which theory was considered most plausible. The full case file, comprising 11 pages as held by the National Archives, is reproduced below.