Record 029 · February 1949
Project SIGN Technical Report – Unidentified Aerial Objects (February 1949)
U.S. Air Force / Air Materiel Command · United States
Ledger illustration of the record — not a scan of the original paper. — Night Ledger illustration of the file
The report reviews numerous sighting reports from 1947–1948, analyzing witness accounts, radar data, and physical evidence where available. It estimates that a small percentage of cases could not be explained by conventional aircraft, balloons, or astronomical phenomena and discusses the possibility of interplanetary origins as one hypothesis, though without conclusive proof. The study recommended continued investigation with improved instrumentation. This document represents one of the earliest formal military scientific evaluations of the phenomenon and is distinct from later projects like Grudge or Blue Book. It has been digitized and made available as part of broader declassified UFO/UAP holdings at the National Archives.
Public file: National Archives Catalog
