owned the aircraft and the Air Force Reserve or Air National Guard wing or group co-located with the active duty unit, providing only manpower. To take advantage of the synergies and aircraft, active duty units are now being stood up at what were previously Air Force Reserve Command or Air National Guard locations, where the Air Reserve Component organization technically "owns" the aircraft, but share them with an active duty squadron, group or wing that provides additional manning. This enables the Air Force to be more productive in meeting the global demands for primarily the Mobility Air Forces (MAF), the Air Force's cargo and aerial refueling aircraft, although the concept is now being extended to the Combat Air Forces (CAF), the Air Force's fighter, bomber, reconnaissance, rescue and special operations aircraft, as well. The result is a more cost-effective way to meet increasing mission requirements. In an active associate unit, the Air Force Reserve or Air National Guard owns the aircraft, while the active duty Regular Air Force embeds a squadron, group or wing that provides air crews, aircraft maintenance and support personnel who share the responsibility of flying and maintaining the AFRC or ANG aircraft. In a traditional associate unit, Air Force Reservists fly and maintain aircraft owned by the active duty Regular Air Force. In many of these units, particularly in the MAF, the aircraft have been re-marked to include both Regular Air Force and Air Force Reserve Command or Air National Guard organizational and unit markings. A corollary unit is an Air Force Reserve or Air National Guard squadron or group attached to an active duty squadron or group. Associate unit reservists are most heavily concentrated in the Air Mobility Command (AMC) and fly AMC's largest airlifters, the C-5 Galaxy, and the newest AMC global airlifter, the C-17 Globemaster III, with Air Force Reserve associate crews accounting for nearly 50 percent of the Air Force's total C-5 and C-17 air crew capability. AFRC also provides sole Formal Training Unit (FTU) functions in the C-5 for the Regular Air Force, the Air Force Reserve, and prior to the C-5's retirement from that component, the Air National Guard. AFRC also provides aerial refueling capability with aircrews operating AMC KC-10 Extenders in associate units and KC-135 Stratotankers in both associate and Air Reserve Component air mobility wings, air refueling wings and air refueling groups. Associate KC-10 units provide 50 percent