(covers information from several alternate timelines)
The United States Army Air Forces (USAAF) was the aviation division of the United States Army in the early 20th century. As atmospheric flight became more advanced, the Air Forces became a separate military branch, the United States Air Force.
In July, 1947, the Air Forces retrieved a Ferengi shuttle which had crash landed in Roswell, New Mexico, after the shuttle had traveled back in time from the year 2372 via time warp. Air Forces general Rex Denning oversaw the interrogation of the vessel's three inhabitants, whom he believed to be alien invaders. The three Ferengi were eventually able to escape with the assistance of two helpful Humans, retrieve their ship, and return to their own time by recreating the time warp. The Air Forces subsequently covered up the incident, issuing an official statement claiming that only a weather balloon had been recovered in Roswell. (DS9: "Little Green Men")
United States Army Air Forces personnel
- Carlson, Jeff (attached civilian Professor)
- Denning, Rex (Lieutenant general)
- Garland, Faith (Nurse)
- Wainwright (Captain)
While teleplay writers Ira Steven Behr and Robert Hewitt Wolfe consistently refer to the service branch of the United States armed forces encountered in "Little Green Men" as the "Army Air Corps", and to Denning as an "Army Air Corps general" in the script, both they and the Star Trek fact checkers had overlooked that this constituted an anachronism: the "United States Army Air Corps" (USAAC) had been renamed to "United States Army Air Forces" (USAAF, and plural to indicate the proliferation of specialized departments within the service) on 20 June 1941, six years prior to the events depicted in the episode. However, the USAAC designation was neither seen nor heard even once in the episode. Meanwhile, the wardrobe department of Star Trek had, unwittingly or not, paid closer attention to the actual historical development, as the uniforms of the American soldiers were endowed with the proper, time-period correct USAAF service emblems (the USAAC emblem lacked the birds/wings), which were prominently featured in the episode.
As the original name already suggested, the service started out as a branch of the US Army, but was by the time of World War II already a full-fledged, de facto independently operating military service on its own. In order to reflect this, and just two months after the events depicted in "Little Green Men", the service was again renamed to "United States Air Force" (USAF, and singular to emphasize its separate status) on 18 September 1947, which is the name it still holds to date.
Real world Star Trek affiliated USAAF enlistees included Creator Gene Roddenberry and Art Director Matt Jefferies, both serving as bomber pilots during World War II with Roddenberry serving in the Pacific Ocean theater, whereas Jefferies flew over North-Africa and southern Europe.