Nathan Farragut Twining was a senior Army Air Forces and U.S. Air Force officer whose brief postwar command of Air Materiel Command made him the signature authority behind the 1947 Twining memo, a key bridge between the first flying-disc wave and formal Air Force UFO investigation.123
Military Career
Twining was born in Monroe, Wisconsin, in 1897, graduated from the United States Military Academy in 1918, and became an Army aviator after flight training at Brooks and Kelly Fields.1 During World War II he commanded major air forces in the South Pacific, Italy, and the final B-29 campaign against Japan.1
In December 1945, Twining became commanding general of Air Materiel Command at Wright Field, Ohio, the engineering and technical-intelligence environment that later evaluated flying-disc reports.1 His September 23, 1947 memo was issued five days after the Department of the Air Force was formally established, though the document still moved through Army Air Forces channels during the transition to the new service.23
Twining left Air Materiel Command on October 1, 1947, for Alaskan command assignments, later returned to Washington as vice chief of staff, became Air Force chief of staff in 1953, and was sworn in as chairman of the Joint Chiefs of Staff in 1957.1
Origin of the UFO Role
The Twining memo began as an Air Staff request. Brig. Gen. George Schulgen's AC/AS-2 office furnished interrogation-report data to Air Materiel Command, where T-2 intelligence, the Aircraft Laboratory, Engineering Division T-3, the Air Institute of Technology, and aircraft, power-plant, and propeller laboratory personnel formed a command opinion in conference.34
The memo's famous finding was cautious but consequential: the reported phenomenon was "real and not visionary or fictitious."34 It also allowed that some incidents might have natural causes such as meteors, noted the lack of recovered physical exhibits, and treated unknown domestic work or foreign development as possibilities rather than declaring an extraterrestrial origin.34
This makes Twining important less as a witness than as a command-level filter. He attached senior authority to a technical-intelligence judgment produced at Wright Field from pilot reports, radar-linked claims, and engineering review, then sent it upward for institutional action.34
Formal Investigation
The memo's most important recommendation was bureaucratic. Twining asked Headquarters, Army Air Forces to assign a priority, security classification, and code name for a detailed study; to route complete data to military, atomic-energy, aeronautical, and research organizations; and to require a preliminary report followed by continuing progress reports.34
Project Sign was the result of that conversion from scattered reports to a named program. The February 1949 Air Materiel Command report says Project Sign was initiated by the Technical Intelligence Division on January 22, 1948, under the authority of a December 30, 1947 Deputy Chief of Staff, Materiel letter.5
The Condon Report later described Twining's September 23 letter as one of the earliest formal actions toward an official flying-saucer study and said the new activity was given the code name Project Sign and priority 2-A by the December 30, 1947 letter.6 CIA historian Gerald Haines likewise credited Twining with establishing Project Sign, initially Project Saucer, to collect, collate, evaluate, and distribute UFO information within the government on the premise that the reports might carry national-security concern.7
Blue Book Lineage
Twining did not personally run Project Blue Book. His role was earlier and upstream: he gave the flying-disc question the command legitimacy and technical-study framing that Project Sign inherited, and that later passed through Project Grudge into Blue Book.5678
National Archives history describes Project Sign as beginning in late 1947, Project Grudge as its scaled-down continuation, and Project Blue Book as the March 1952 to December 1969 successor headquartered at Wright-Patterson Air Force Base.8 NARA's Blue Book guide records 12,618 reports from 1947 to 1969, with 701 left unidentified, while also repeating the Air Force conclusion that the investigations found no demonstrated national-security threat, unknown advanced technology, or extraterrestrial vehicles.9
AARO's 2024 historical review places Project Sign, Grudge, and Blue Book in the same official U.S. government UAP investigation lineage. It describes Sign as a high-priority effort that examined whether reports might involve Soviet secret weapons or extra-planetary objects, evaluated 243 reports, recommended continued military-intelligence control, and still lacked definite proof for or against unconventional unknown aircraft.10
Assessment
Twining's significance is precise. He did not prove what the objects were, and his memo did not claim alien craft. He did, however, turn the 1947 flying-disc wave into an authorized technical-intelligence problem: structured data collection, interagency circulation, classification, priority, and a named follow-on study.345
That is why the Twining memo remains central to early UFO history. It marks the point where the Air Force's public later stance of skepticism began from an internal admission that enough reports were credible, strange, and strategically sensitive to warrant a formal investigation rather than dismissal as rumor alone.36810