In 1948, the USAF's Project Sign wrote a Top Secret Estimate of the Situation, concluding that the ETH was the most likely explanation for the most perplexing unexplained cases. The study was ordered destroyed by USAF chief of staff General Hoyt Vandenberg, citing lack of proof. Knowledge of the existence of the Estimate has come from insiders who said they read a surviving copy, including later USAF Project Blue Book head Edward J. Ruppeltand astronomer and USAF consultant Dr. J. Allen Hynek. - Wiki
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