AMC has undergone considerable change since its establishment. Focusing on the core mission of strategic air mobility, the command divested itself of infrastructure and forces not directly related to Global Reach. The Air Rescue Service, intratheater aeromedical airlift forces based overseas and much of the operational support airlift fleet were transferred to other commands. However, all KC-10 Extender and most KC-135 Stratotanker air refueling aircraft initially assigned to Air Combat Command following the disestablishment of Strategic Air Command (SAC) were transferred to AMC, along with Grand Forks AFB, McConnell AFB and Fairchild AFB.