“Unknown, luminous things, or beings, have often been seen, sometimes close to this earth, and sometimes high in the sky. It may be that some of them were living things that occasionally come from somewhere else in our existence, but that others were lights on the vessels of explorers, or voyagers, from somewhere else.”[I-1] These extraterrestrials may have been in communication with earthmen for many years, Fort suggested, and they may sometimes kidnap and carry away human beings. _UFO Reports and the Air Force_ Most flying-saucer reports have come from reliable citizens who have seen something extraordinary, something they do not understand. Genuinely puzzled, they often report the incident to the nearest Air Force base. The evaluation of such cases is the responsibility of the United States Air Force. Since the beginning of the saucer scare in 1947, the chief investigating agency has been that at Wright-Patterson Air Force Base, Dayton, Ohio, and has borne a succession of names--Project Sign, Project Grudge, Project Blue Book, and the Aerial Phenomena Group of the Aerospace Technical Intelligence Center, usually known as ATIC. Until recently this group operated under the jurisdiction of the Assistant Chief of Staff, Intelligence. On July 1, 1961, it was transferred to the jurisdiction of the Air Force Systems Command. To simplify discussion in this book, however, the group that investigates unidentified aerial phenomena is generally referred to as ATIC. In military parlance the phrase “unidentified flying object,” abbreviated as UFO, is used to indicate any air-borne phenomenon that fails to identify itself to, or to be identified by, trained witnesses on the ground or in the air who are using visual or radar methods of observation. Created in the early days of the saucer era, the term UFO is unfortunately misleading because it seems to imply that the unknown is a solid material object. Many of them are not. The more dramatic phrase “flying saucer” is similarly misleading because not all the unknowns are shaped like a saucer, and not all of them are flying. Since no one has been able to devise a more accurate brief term that will apply to all reports in this category, both “UFO” and “flying saucer” have remained in common use. Air Force investigators and scientists have been able to account for almost every reported “spaceship” as the result of failure to identify some natural phenomenon. Some were the product of delusion or deliberate hoaxes. A few remain technically “Unknown” because, although the probable explanation is obvious, too few facts are available to permit a positive identification. No such report suggests the possibility that interplanetary craft are cruising in our skies. _The Scientist’s View_