EntityQ2400383· pop 10· linked from 285 articlesProject GrudgeSign in to saveShort-lived project by the U.S. Air Force to investigate unidentified flying objects (UFOs)Connectionsalien abductionEntityPentagon UFO videosEntityThe Age of DisclosureWorkInternational Standard Book NumberEntityunidentified flying objectEntityUnited States Air ForceEntityArea 51EntityufologyEntityhoaxEntitycrop circleEntityRoswell incidentEntityancient astronautsEntitygrey alienEntityflying saucerEntitymen in blackEntityJ. Allen HynekEntityProject Blue BookEntityBob LazarEntityfoo fighterEntityNazi UFOsEntityCategoriesProjects of the United States Air ForceUFO culture in the United StatesUnited States government responses to UFOsWright-Patterson Air Force Base