USCENTCOM and USSOCOM at MacDill. New C-37A aircraft were delivered starting in 2001, and the CT-43 and EC-135s were subsequently removed from service. The 310th's primary mission is dedicated airlift support for the commanders of USCENTCOM, USSOCOM, and USSOUTHCOM. With the addition of the 310 AS, the wing was given its current designation as the 6th Air Mobility Wing (6 AMW). In April 2008, pursuant to BRAC action, the Air Force Reserve Command's 927th Air Refueling Wing relocated from Selfridge Air National Guard Base, Michigan, to MacDill AFB, where it became an associate wing to the 6 AMW, also flying KC-135R aircraft. Tenant units In late 2003/early 2004, U.S. Naval Forces Central Command vacated its Tampa "rear headquarters" at MacDill AFB, a complex that was established in the early 1990s following the first Gulf War and commanded by a flag officer, either an upper half or lower half rear admiral concurrently assigned as the USNAVCENT/US 5th Fleet Deputy Commander (DEPCOMUSNAVCENT/DEPCOMFIFTHFLT), and his staff when they were not forward deployed to the Persian Gulf region. In vacating the MacDill AFB facility, all USNAVCENT staff activities were consolidated at COMUSNAVCENT/COMFIFTHFLT headquarters in Manama, Bahrain. NAVCENT's facility at MacDill AFB was subsequently turned over to the Deputy Commander, U.S. Marine Forces Central Command (DEPCOMUSMARCENT), and his staff. It would later become the overall Headquarters, U.S. Marine Forces Central Command, while the Commanding General for MARCENT (COMUSMARCENT) would remain a dual-hatted function of the Commanding General, I Marine Expeditionary Force (I MEF) at Camp Pendleton, California. From late 2003 until 2012, the Commanding General remained in California, while his MARCENT staff primarily resided at MacDill AFB with an additional forward element at Naval Support Activity Bahrain in Manama, Bahrain. In 2012, the COMUSMARCENT and CG I MEF billets were broken into separate billets and COMUSMARCENT took up full-time residency in MARCENT's headquarters facility at MacDill AFB, upgrading the facility to a 3-star headquarters. Also in late 2004/early 2005, Naval Reserve Center Tampa vacated its obsolescent waterfront location in downtown Tampa, consolidated with the former Naval Reserve Center St. Petersburg adjacent to Coast Guard Air Station Clearwater, and relocated to a newly constructed facility on the south side of MacDill AFB. In 2006, this facility was renamed Navy Operational Support Center Tampa, concurrent with the shift in name of the U.S. Naval Reserve to the U.S. Navy Reserve and its greater integration into the Fleet