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Edward J. Ruppelt (July 17, 1922 - September 1960) was a United States Air Force officer probably best-known for his involvement in Project Blue Book, a formal governmental study of unidentified flying objects. He is generally credited with coining the term "unidentified flying object", to replace the terms "flying saucer" and "flying disk," which had become widely known; Ruppelt thought the latter terms were both suggestive and inadequate.