The 321st Air Expeditionary Wing is a unit of the United States Air Force, serving under Air Mobility Command. Primarily stationed at Davis-Monthan Air Force Base in Tucson, Arizona, it operates as a strategic air mobility organization responsible for aerial refueling and strategic air transport missions worldwide. The wing consists of various units that include airlift and tanker aircraft, such as the C-17 Globemaster III and KC-135 Stratotanker. It plays a crucial role in global operations, providing rapid mobility capabilities to deliver troops, equipment, and supplies, as well as extending the range of other military aircraft.