Projects Sign, Grudge & Blue Book
Project Sign (1948) became Project Grudge (1949) and then Project Blue Book (1952). Under Captain Edward Ruppelt, who coined the term 'unidentified flying object,' Blue Book took reports seriously. Later it was understaffed and often criticized for forcing explanations onto cases. Astronomer J. Allen Hynek served as its scientific consultant for most of its life and grew more convinced over time that some cases deserved real study. The Air Force closed Blue Book on December 17, 1969.
The ledger
What the record shows, what people say, and the best explanation available so far.
What's documented
- The full case files were declassified and transferred to the National Archives.
- The final tally was 12,618 reports, 701 of them listed as unidentified.
What's claimed
- Blue Book was a public-relations front while the real work happened elsewhere.
Best explanation so far
This is the largest public archive of UFO reports in existence. Most cases have ordinary explanations, though the quality of the investigations varies a lot.
Check the sources
Go to the originals. Every link opens the archive or record in a new tab.
If you liked this one
The Twining Memo
A top general tells the Pentagon the saucer reports deserve serious study.
The Robertson Panel
The CIA asks top scientists if UFOs are a threat. Their answer shaped policy for decades.
The Condon Committee
An independent scientific study concludes UFOs are not worth further study. Its own data was messier.
Blue Book Special Report No. 14
The first big statistical study of UFO reports, and an argument still running.