Nathan F. Twining

Nathan Farragut Twining (11 October 1897 – 29 March 1982) was a U.S. Air Force General who served as Chairman of the Joint Chiefs of Staff from 1957 to 1960 and, before that, as Chief of Staff of the Air Force (1953–1957). In 1947 he commanded the Air Materiel Command at Wright-Patterson AFB and is best known in UFO history for his classified memorandum of 23 September 1947 to Brigadier General George Schulgen. In it he stated that the reported phenomenon was "something real and not visionary or fictitious" and recommended the establishment of a formal investigation program — which led directly to the creation of Project Sign in January 1948.

• U.S. Air Force General, Chairman of the Joint Chiefs of Staff 1957–1960
• Previously Chief of Staff of the Air Force (1953–1957)
• Commanding general of the Air Materiel Command at Wright-Patterson AFB in 1947
• Classified memorandum of 23 September 1947 addressed to Brigadier General George Schulgen
• Key wording: the phenomenon is "something real and not visionary or fictitious"; recommended a formal investigation program
• Led directly to the creation of Project Sign in January 1948 — the first official U.S. military UFO investigation
• One of the most significant official acknowledgments of the reality of unidentified aerial phenomena

For the UAP timeline, Twining is the historical starting point of U.S. government UFO research: without his memo there would be no Project Sign, no Grudge/Blue Book lineage and probably no later programs such as AATIP or AARO. His role shows that as early as 1947 — just weeks after Kenneth Arnold's sighting — it was internally conceded at the highest military level that the phenomenon was real and had to be investigated systematically.