David-Monthon AFB. Arizona, [ILLEGIBLE]Date unknown

On August 27, 1952, at 9:15 a.m., two U.S. Air Force personnel at David-Monthan Air Force Base near Tucson, Arizona, watched two brilliant blue-white objects move across the sky near the sun. T/Sgt Amadeo J. Sandoval, a photographer, and A/1C Robert G. Smith both observed the objects for about ten minutes from the same location. The two objects appeared to be made of a metallic substance and were round in shape, though their exact size and altitude could not be determined. Based on the observers' estimates, object 1 seemed to be about twice as high as object 2, with object 2 appearing roughly the size of a B-29 bomber at approximately 10,000 feet.

The objects moved in erratic, pendulous paths at varying speeds. Object 1 traveled generally southward at a slow, constant rate. Object 2 moved in a southeasterly direction, traveling somewhat faster with more pronounced erratic movements. During the observation, object 2 twice increased its speed and appeared to emit a tail or trail of an unknown white substance that was less dense than the object itself and completely lacking the blue color of the main body. This tail disappeared when the object's speed decreased. The observers noted neither object had any visible flight surfaces or projections. The observation lasted approximately ten minutes with no sounds heard. Sandoval photographed object 2 just as it accelerated before disappearing. Object 1 continued at constant speed until it vanished toward the south, while object 2 eventually shot out of sight in a due-east direction at extremely high speed.

Sandoval was a highly experienced photographer with twelve years of Air Force service and seven years of photographic experience. He was considered sincere, discreet, and extremely reliable by his supervisors. Smith, with seventeen months of service, was considered absolutely reliable by his supervisors. During the observation, Sandoval wore polaroid sunglasses and noted that the objects' brilliance was not reduced by the dark lenses. The weather at the time was clear, with scattered clouds at 14,000 feet and visibility of forty miles.

The investigating officer noted that numerous people in the Tucson area reported seeing similar objects at the same time. The investigator made no meteorological explanation for the sighting. The file indicates the final evaluation was marked "unknown," though the OCR text on this point is partially unclear.

The complete case file, comprising eight pages as held by the National Archives, is reproduced below.