Bellefonte, PennsylvaniaSeptember 1952

On the night of September 14, 1952, two security officers on duty at the west gate of Olmsted Air Force Base near Bellefonte, Pennsylvania saw an object that the U.S. Air Force would ultimately classify as unidentified. The men reported seeing a large object with a brilliant blue glow, which one observer compared to a watermelon. The sighting lasted approximately three minutes.

The officers were first drawn to the object by a sound similar to a motorboat engine. As they watched, the object hung motionless in the sky to the southwest, roughly 22 degrees above the horizon. It then began moving horizontally, hesitated, moved again in a southeasterly direction, and finally accelerated and appeared to drop toward the Susquehanna River below. The sound stopped as soon as the object started moving. Both men noted that the object became brighter once it began moving, and neither saw any trail or exhaust. The object eventually disappeared behind a tree, and the observers could not determine whether it had dropped into the river or landed beyond the distant hills. Weather conditions at the time were clear with two to three miles of visibility.

The initial Air Force response suggested relatively simple explanations. An intelligence officer reviewing the case concluded that the object seen on September 12 was probably a blimp, and that the object observed the following night (September 14) was likely an extremely bright star or planet. However, the officer acknowledged these explanations were not conclusive. The final evaluation marked the case as unidentified, reflecting uncertainty about what the two officers actually witnessed.

The complete case file, held by the National Archives, spans 13 pages.