An F-16 Fighting falcon pilot flies over the Nevada Test and Training Range as the aircraft is refueled by a KC-135 Stratotanker, June 8, 2017. The KC-135 Stratotanker provides the core aerial refueling capability for the U. S. Air Force and has excelled in this role for more than 50 years. (U.S. Air Force photo by Senior Airman Kevin Tanenbaum/Released)