Ufology is a neologism coine to describe the collective efforts of those who study unidentified flying object reports and associated evidence. Not all ufologists believe that UFOs are necessarily extraterrestrial spacecraft, or even that they are objective physical phenomena. Even UFO cases that are exposed as hoaxes, delusions or misidentifications may still be worthy of serious study from a psychosocial point of view. While Ufology does not represent an academic research program, UFOs have been subject to various investigations over the years, varying widely in scope and scientific rigor. Governments or independent academics in the United States, Canada, the United Kingdom, France, Belgium, Sweden, Brazil, Mexico, Spain, and the Soviet Union are known to have investigated UFO reports at various times. No national government has ever asserted that UFOs represent any form of alien intelligence. Perhaps the best known study was Project Blue Book, previously Project Sign and Project Grudge, conducted by the United States Air Force from 1947 until 1969. Other notable investigations include the Robertson Panel (1953), the Brookings Report (1960), the Condon Committee (1966-1968), the Project Twinkle investigation into green fireballs (1948-1951), the Sturrock Panel (1998), and the French GEIPAN (1977-) and COMETA (1996-1999) study groups.