DISCLOSURE / FILE
Final report of Project Sign, the U.S. Air Force's first formal UFO investigation, delivered to the Pentagon in February 1949 as Technical Intelligence Report No. F-TR-2274-IA.
Final report of Project Sign, the U.S. Air Force's first formal UFO investigation, delivered to the Pentagon in February 1949 as Technical Intelligence Report No. F-TR-2274-IA.
Project Sign was the U.S. Army Air Forces / Air Force Air Materiel Command's first formal program to investigate unidentified flying objects, running from late 1947 through early 1949. Its final technical intelligence report, designated F-TR-2274-IA, was delivered to the Pentagon in February 1949. The report concluded that some reported objects may be of foreign origin but did not determine their nature. The document is preserved on the Project Sign microfilm reels held at archive.org.