Hoyt Vandenberg
General Hoyt S. Vandenberg served as the second Chief of Staff of the United States Air Force from 1948 to 1953. He is significant in UAP history for terminating Project Sign in 1949, citing a lack of proof for the extraterrestrial or interplanetary interpretation of UFO reports — despite the project's own written findings concluding that some reports presented actual objects of undeterminable origin.
| Role | U.S. Air Force General; Chief of Staff of the Air Force |
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Termination of Project Sign
Project Sign, established in 1948 by Lieutenant General Nathan Twining, had produced a classified report acknowledging that some UFO sightings represented real, unidentified objects. UFO researcher and future Project Blue Book director Edward J. Ruppelt later stated that Sign had privately endorsed the interplanetary explanation for some of its unexplained cases. Vandenberg overruled and shut down the program in 1949, dismissing its conclusions for lack of sufficient evidence.
The shuttering of Project Sign immediately preceded the formation of Project Grudge, commissioned the same year, which operated under an explicit directive to explain UFO sightings away rather than investigate them objectively. The sequencing — Sign dissolved for reaching inconvenient preliminary conclusions, Grudge formed to produce predetermined dismissive ones — is cited in UAP research as early evidence of deliberate institutional suppression.