Project 10073 Record Card — Lexington, Massachusetts, 29 December 1954

This document is a formal Air Intelligence Information Report regarding an Unidentified Flying Object (UFOB) sighting that occurred on 29 December 1954 near Lexington, Massachusetts. The report, issued by the 6520th Support Wing (Test) at Laurence G. Hanscom Field, details the observations of two witnesses: a civilian toolmaker at Raytheon Corporation and a commercial pilot with 8,700 flying hours. The witnesses described a very bright, moon-shaped object, white to bright blue in color, which appeared to be the size of a quarter. The object was observed at dusk, moving away and upward at a 90-degree angle relative to the observers. The sighting lasted approximately one minute and twenty seconds. The object was described as having no sound and performing a rapid climb before disappearing. The report includes a supplement detailing the specific conditions of the sighting, noting that there was significant aircraft activity in the area at the time, including T-33 jet aircraft. An investigation into local weather stations and traffic control records was conducted. While the official conclusion on the record card suggests the object was a balloon, the reporting officer's detailed comments in the supplement state that the cause of the objects remained undetermined, noting that traffic control operators on duty did not observe any unusual objects or low-flying aircraft. The document includes a map of the area and is marked as security information.