An F-22 Raptor from Hill Air Force Base, Utah, approaches a KC-135 Stratotanker refueling boom Feb. 7, 2014. The KC-135 provides the core aerial refueling capability for the Air Force and has filled this role for more than 50 years. The tanker is assigned to Fairchild AFB, Wash. (U.S. Air Force photo/Senior Airman Mary O'Dell)