Airman 1st Class Jonathan Ordonez, KC-135 crew chief student, services the reserve break accumulator on the aircraft. Ensuring heavy aircraft can complete their mission for the Air Force starts at Sheppard in the 362nd Training Squadron's Heavy Training Flight. There are about 500 Airmen at any given time attending heavy crew chief training at Sheppard Air Force Base, Texas. (U.S. Air Force photo/Airman 1st Class Candy Miller)