Capt. Gregory took over as Blue Book's director in 1956. Jerome Clark writes that Gregory led Blue Book "in an even firmer anti-UFO direction than the apathetic Hardin." The 4602nd was dissolved, and the 1066th Air Intelligence Service Squadron was charged with UFO investigations. In fact, there was actually little or no investigation of UFO reports; a revised AFR 200-2 issued during Gregory's tenure emphasized that unexplained UFO reports must be reduced to a minimum. One way that Gregory reduced the number of unexplained UFOs was by simple reclassification. "Possible cases" became "probable", and "probable" cases were upgraded to certainties. By this logic, a possible comet became a probable comet, while a probable comet was flatly declared to have been a misidentified comet. Similarly, if a witness reported an observation of an unusual balloon-like object, Blue Book usually classified it as a balloon, with no research and qualification. These procedures became standard for most of Blue Book's later investigations. Gregory was replaced in 1958 by Major Robert J. Friend.