At the outset, the consensus among Sign researchers seems to have been that the flying disks (UFOs) were real and were most likely advanced Soviet aircraft, possibly developed from German prototypes captured at the end of World War II. During the 368 days of Sign's existence, however, opinion shifted to the extent that in a secret document entitled, Estimate of the Situation, which reached U.S.A.F. Chief of Staff General Hoyt S. Vandenburg in early October 1948, it was suggested that the extraterrestrial hypothesis offered the best solution to the mystery of the flying disks. Vandenburg rejected this conclusion, the document was declassified a few months later, and all copies of it were ordered burned. When the destruction order became public knowledge, in the mid-1950s, it served to inflame a growing belief that the government was orchestrating a cover-up as to the true nature of UFOs. Subsequent denials by the Air Force that the Estimate document had ever existed only further exacerbated the situation. Following Vandenburg's rejection of the extraterrestrial hypothesis, supporters of this view at Sign were gradually reassigned to other duties until skeptics became the majority. In its final report, Project Sign expressed itself guardedly on the extraterrestrial issue:
It is hard to believe that any technically accomplished race would come here, flaunt its ability in mysterious ways and then simply go away ... Only one motive can be assigned; that the spacemen are "feeling out" our defenses without wanting to be belligerent. If so, they must have been satisfied long ago that we can't catch them... Although visits from outer space are believed to be possible, they are believed to be very improbable. In particular, the actions attributed to the "flying objects" reported during 1947 and 1948 seem inconsistent with the requirements for space travel.On February 11, 1949, Project Sign gave way to its successor, Project Grudge.
Related category UFOs
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