Sept. 2, 1953; Sidi Slimane AFB, French Morocco (BBU)

9:14 p.m. Lt. Col. William Moore and 1st Lt. J. H. McInnis. (Berliner)

9:14 p.m. local. An unidentified flying object was sighted by the crew of a USAF C-47 on a routine training flight. The light was first observed at an estimated altitude of 4,000 feet above the C-47. The object's rate of closure was very fast and followed a near collision course in relation to the C-47. The approaching object, when level with the C-47, excuted a 180 degree descending turn at high speed. The object then made a second 180 degree turn to an altitude of approximately 700 feet, followed by a 90 degree turn toward the main highway that parallels the Sidi Slimane AFB at which point it appeared stationary. It then disappeared. The observers flew the C-47 in a 360 degree circle in order to continue the observation of the object. The light was seen for approximately three minutes. There were no reported aircraft in the area.

J. Allen Hynek:
(23 November 1953) The Sidi Slimane sighting is definitely puzzling and will probably have to remain on the books as unexplained.