Immediately after World War II, the Army's San Antonio Air Technical Service Command established a storage facility for B-29 and C-47 aircraft at Davis-Monthan AFB. Today, this facility is the 309th Aerospace Maintenance and Regeneration Group (309 AMARG), which has grown to include more than 4,400 aircraft and 13 aerospace vehicles from the Air Force, Navy-Marine Corps, Army, Coast Guard, and several federal agencies including NASA.
Davis-Monthan's primary operational mission is to train A-10 and OA-10 pilots and to provide A-10 and OA-10 close air support and forward air control to ground forces worldwide. In addition, the attached AMARG facility functions as a long term storage and reclamation facility for excess DoD, USCG, NASA and other U.S. government aircraft.
The 7,000 military and 1,600 civilian employees who work on the base are paid $199 million annually, and the base has an estimated $750 million economic impact on Tucson as a whole.