Project Grudge
The U.S. Air Force's second UFO investigation program (1949–1951), designed to debunk UFO reports following Project Sign's extraterrestrial conclusion.
OVERVIEW
Project Grudge replaced Project Sign in February 1949 with an explicitly skeptical mandate. Where Sign had investigated seriously, Grudge was tasked with explaining away UFO reports and reassuring the public. Its final report concluded all UFO reports could be explained by misidentification, hoaxes, or psychological phenomena. However, internal documents reveal that Grudge's own investigators found some cases genuinely puzzling. The project was criticized by both UFO researchers and military pilots for its dismissive approach. It was eventually replaced by Project Blue Book in 1951.
KNOWN FACTS
Grudge's charter explicitly tasked it with 'debunking' UFO reports
The Final Report (1949) dismissed all cases, contradicting internal investigator notes
Military pilots complained that Grudge investigators did not take their reports seriously
FOIA documents show cases were closed without proper investigation
The shift from Sign (extraterrestrial conclusion) to Grudge (blanket dismissal) was swift and unexplained
CLAIMS
Grudge was deliberately designed to debunk and dismiss rather than investigate
The project's own investigators were pressured to ignore credible evidence
Grudge ignored or suppressed reports from military pilots and radar operators
The project served a public relations function, not a genuine investigative one
The pattern of dismissal established by Grudge continued through Blue Book
EVIDENCE FOR
Grudge's charter explicitly tasked it with 'debunking' UFO reports
The Final Report (1949) dismissed all cases, contradicting internal investigator notes
Military pilots complained that Grudge investigators did not take their reports seriously
FOIA documents show cases were closed without proper investigation
The shift from Sign (extraterrestrial conclusion) to Grudge (blanket dismissal) was swift and unexplained
EVIDENCE AGAINST
Most UFO reports at the time had proven conventional explanations
Cold War security concerns justified a skeptical approach to prevent false alarms
The same investigators worked under Grudge and later Blue Book
Some psychological explanations (e.g., 'mass hysteria') are scientifically valid
Grudge's recommendations for improving reporting procedures were reasonable
OPEN QUESTIONS
No open questions recorded.
SOURCES
TIMELINE
Project Grudge established, replacing Project Sign
Grudge Final Report concludes all UFOs have conventional explanations
Project Grudge terminated; Project Blue Book established