1948
HALL III · 1948 — 1951
Project Sign and Project Grudge
The first USAF investigations
Wright-Patterson Air Force Base, Ohio
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Established in January 1948 in response to the wave of sightings the previous summer, Project Sign was the first formal United States Air Force investigation. Its 'Estimate of the Situation' — which is believed to have concluded the phenomenon was interplanetary — was rejected by Chief of Staff Hoyt Vandenberg and reportedly destroyed. Sign was renamed Project Grudge in 1949 with an explicitly debunking posture, and folded into Blue Book in 1952.
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