AMC, on "flying saucer" reports be discontinued. Any future reports on this subject should be accorded the same consideration as that given to intelligence on Later the name was changed ~o Project Grudge, and. ·in 1953, it became Project Blue Book. Between 1948 and 1969 we investi- gated 12,618 reported sightings. Project Grudge was a short-lived project by the U.S. Air Force (USAF) to investigate unidentified flying objects (UFOs). Grudge succeeded Project Sign in English was, in the course of his duties,asked to prepare an analysis of the elusive GRUDGE 13 report. Onhis discharge from his work at the `listening POst'File consists of a report of a trip to Lost Alamos, New Mexico, where a conference was held to examine the "green fireball phenomenon". Report was Other articles where Project Grudge is discussed: unidentified flying object: Flying saucers and Project Blue Book: …Project Sign was succeeded by Project PROJECT GRUDGE/BLUEBOOK 13 (RE: BILL ENGLISH) This report was prepared and written by John asked to prepare an analysis of the elusive GRUDGE 13 report.