UNIDENTIFIED FLYING OBJECTS - Report by the "Flying Saucer" Working Party

This document, dated June 1951, is a formal intelligence assessment produced by the British Ministry of Defence's Directorate of Scientific Intelligence and the Joint Technical Intelligence Committee. It serves as a report by the 'Flying Saucer' Working Party, tasked with evaluating the phenomenon of Unidentified Flying Objects (UFOs). The report provides a historical overview, noting that sightings began in Sweden in 1946, followed by a surge in the United States in 1947 and the United Kingdom in 1950. The Working Party reviewed American investigations, specifically Projects 'Sign' and 'Grudge', noting that the U.S. authorities concluded that reported incidents were either misinterpretations of conventional objects, mass hysteria, or hoaxes. The British assessment includes detailed investigations into specific sightings in the United Kingdom, including radar reports at Tangmere and visual observations by R.A.F. personnel such as F/Lt. Hubbard. In each case, the Working Party concluded that the sightings were likely optical illusions or misidentifications of conventional aircraft. The report explicitly rejects the hypothesis of extraterrestrial origin, citing the lack of tangible evidence and the principle of parsimony (Occam's Razor). The Working Party recommends against further investigation of subjective reports, suggesting that resources should only be committed if a co-ordinated network of radar and photographic observation is established. The document includes two appendices: one detailing an analysis of an unusual radar response by Mr. G. E. Graham, and another recounting a sighting by Wing Commander Formby, which was ultimately identified as a normal aircraft.