How long did Project Sign investigate UFO sightings?

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Declassified U.S. military video of unidentified aerial phenomena (UAP) — unidentified flying object Learn about an unidentified aerial phenomena (UAP) sighting from this video (known as the Gimbal video) captured by fighter pilots associated with the USS Theodore Roosevelt carrier strike group. The video shows instrument detections of unknown aerial objects, which the pilots were unable to identify, off the East Coast of the United States, 2014–15.

Project Sign was a classified United States Air Force program that investigated UFO sightings from December 1947 to February 1949, a duration of approximately 14 months. During this period, the project investigated 243 reported sightings to determine if they were of extraterrestrial origin or posed a threat to national security.1