United States. Department of the Air Force. Research and Development. Air Force Regulation No. 80-17, “Unidentified Flying Objects (UFO). Washington D. C.: 19 September 1966. (Courtesy of Jim Klotz). Also, AFR 80-17 with changes and attachment at: http://www.project1947.com/shg/condon/appndx-b.html. AFR 80-17 superseded AFR 200-2, 20 July 1962, which had been revised since 26 August 1953.