A black and white photograph of a large, delta-winged aircraft prototype resting on the ground, marked as confidential.
Official description
This file contains an initial report from the Air Materiel Command regarding Project Sign. Project Sign was a 1948-1949 U.S. Air Force program to investigate the nature and origin of unidentified flying objects (UFO). The report details 100 UFO sightings from 1947-1948. The file also contains an article excerpted from “The Aeroplane,” an aviation-focused periodical magazine published between 1911 and 1968, titled “The Biology of the Flying Saucer.”
Reproduced verbatim from the releasing agency.
AI summary
This file consists of a progress report from the Air Materiel Command regarding Project Sign, a U.S. Air Force initiative from 1948-1949 aimed at investigating unidentified flying objects (UFOs). It includes documentation of 100 UFO sightings from 1947-1948, as well as an article from an aviation magazine discussing aspects of flying saucers.