Reporting of Information on Unconventional Aircraft (Great Blue Hill, Milton, Massachusetts, 24 April 1952)

This document is a Spot Intelligence Report dated 29 April 1952, concerning a sighting of two unidentified aerial objects on 24 April 1952, near the Great Blue Hill in Milton, Massachusetts. The report details the observations of two USAF civilian employees assigned to the Radar Systems Laboratory at the AF Cambridge Research Center. The witnesses, who were experienced in tracking aircraft using radar and telescopes, observed two flat, flexible, square-like or diamond-shaped objects for approximately one and a half to two minutes. The objects were described as dark red or dull orange in color, with a size estimated between 10 and 20 feet. They exhibited a wobbly, undulating, and swooping flight path, moving from the northwest to the northeast at an altitude of approximately 1,500 to 2,000 feet and an estimated speed of 120 miles per hour. The witnesses reported that the objects produced no sound, left no trail or exhaust, and possessed no visible aerodynamic features. One observer tracked the objects using a standard U.S. Army Battery Commander's telescope. Both witnesses were adamant that the objects were not birds, kites, or pieces of paper, and did not resemble any known aircraft. The report notes that the radar system on the tower was inoperative at the time of the incident. The investigation, conducted by Special Agent James C. Rindes, concluded that there was no physical evidence, no interception was made, and no identification action was taken. The report was forwarded to the Air Material Command for further intelligence evaluation, with no further action taken by the district.