USAF Project Sign / Grudge / Blue Book

Record

Type

Government UFO investigations

Period

1948–1969

Connection to CASE-001

No direct CASE-001 connection

Key participants

J. Allen Hynek

Status / qualification

Historical official investigations; not proof of extraterrestrial origin | V99: Blue Book termination on 1969-12-17 is documented in Air Force closure correspondence and a fact sheet held in FBI UFO Part 14 (approx pp. 94-97; SRC-V86-63); a documented administrative action, not evidence of hidden continuation.

Source ID

SRC-018