An F-15C Eagle assigned to the 144th Fighter Wing, Fresno Air National Guard Base, Calif., receives fuel from a KC-135 Stratotanker assigned to McConnell Air Force Base, Kan., Oct. 24, 2015. The KC-135 has provided the core aerial refueling capability for the United States Air Force for more than 50 years. (U.S. Air Force photo/Senior Airman Victor J. Caputo)