UNCONVENTIONAL AIRCRAFT Sighted over Suisun Marsh, Solano County, California 20 April 1952

This document is a report of investigation conducted by the Office of Special Investigations (OSI) regarding a sighting of an unconventional aircraft over Suisun Marsh, Solano County, California, on 20 April 1952. The investigation was initiated following a letter from a witness, identified as a dentist, who reported seeing a bright, luminous object traveling across the sky. The witness, who was at his country home near Birds Landing, observed the object at approximately 0300 hours. He described the object as circular in shape, bluish-white in color, and approximately twice the size of the moon. According to the witness, the object traveled in a straight line from the northwest horizon to the southwest horizon over a period of one to two minutes. He noted that the object performed no maneuvers, had no visible aerodynamic features, left no trail or exhaust, and made no sound. The witness further reported that the object disappeared and reappeared abruptly three times during the observation. The sky was described as cloudless with excellent visibility. The witness, who possesses normal vision and does not require glasses, stated he was not under the influence of alcohol or drugs and was not hallucinating. The investigation concluded that the object did not appear to be a meteor. No further investigative action was deemed necessary, and the case was closed by the 19th OSI District. The report includes administrative details, such as the involvement of the Air Technical Intelligence Center and the U.S. Weather Bureau, and notes that the witness had never seen a phenomenon of this type before.