The project was established in 1948 by Air Force General Nathan David Glasgow Farragut Twining, head of the Air Technical Service Command, and was at the start named Project SAUCER. The goal of the project was to gather, evaluate, and distribute inside the govt. all data concerning phantasma sightings, on the premise that they may represent a national security concern.
At first the project hypothesized the sightings could be Soviet secret weapons. However, Project Sign’s final report, revealed in early 1949, declared that whereas some UFOs perceived to represent actual craft, there wasn’t enough information to see their origin. most cases were explained by standard causes, however the report suggested a continuation of the investigation of all sightings.
Project Sign was 1st delineated within the 1956 book The Report on Unidentified Flying Objects by retired Air Force Captain Edward J. Ruppelt United Nations agency later directed Project Grudge and Project Blue Book. during this he conjointly claimed that Sign had created Associate in Nursing “Estimate of the Situation” that supported Associate in Nursing heavenly body clarification for UFOs, however General Hoyt Vandenberg, Chief of employees of the Air Force, stop working Project Sign for lack of proof. No copy of this document or the other certification of Ruppelt’s claim has been created, and well-liked Mechanics referred to as the report “probably a lot of mythological than real”.
Project Sign was followed by Project Grudge when a conclusion was reached that evaluations of UFOs were a necessity of military intelligence in a very post-war climate.