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07. Projects Sign, Grudge and Blue Book
From Project Sign to Blue Book: Early Government Posture
Project Sign/Grudge: Early US Government Posture
Explore how early U.S. Air Force projects: Sign, Grudge, and Blue Book; shaped official responses to UAP reports from 1947 through the early Cold War.
Project Sign’s Classified UAP Report, 1948: The Beginnings of Secrecy
Discover the origins and findings of Project Sign’s 1948 Air Intelligence Report No. 100‑203‑79, the USAF’s first in‑depth UAP intelligence study.
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