🌐EnglishEnglishFrançaisItalianoPolskiPortuguêsTiếng Việt日本語EntityQ2400383· pop 10· linked from 285 articlesProject GrudgeShort-lived project by the U.S. Air Force to investigate unidentified flying objects (UFOs)Wikidata factsImageProject Blue Book, complete status reports.pdfSources (2)wikidata.orgen.wikipedia.orgvia Wikidata · CC0Available in 9 languagesFrançais日本語PortuguêsItalianoCroatianPolskiRomanianTiếng Việtvia Wikidata sitelinks · CC0Connectionsalien abductionEntityPentagon UFO videosEntityCategoriesProjects of the United States Air ForceUFO culture in the United StatesUnited States government responses to UFOsWright-Patterson Air Force Base