Eighteenth Air Force (Air Forces Transportation) (18 AF) is the only Numbered Air Force (NAF) in Air Mobility Command (AMC) and one of the largest NAFs in the United States Air Force. 18 AF was activated on 28 March 1951, inactivated on 1 January 1958, and re-activated on 1 October 2003. 18 AF is headquartered at Scott Air Force Base, Illinois.

Donaldson Air Force Base is a former facility of the United States Air Force located south of Greenville, South Carolina. It was founded in 1942 as Greenville Army Air Base; it was deactivated in 1963 and converted into a civilian airport. It is currently an active airfield known as Donaldson Center Airport.