F-15C Eagles assigned to the 131st Fighter Squadron at Barnes Air National Guard Base, Mass., and the 194th Fighter Squadron at Fresno Air National Guard Base, Calif., wait to refuel beside a KC-135 Stratotanker during a Red Flag 16-1 training mission on Feb. 11, 2016. The concept of Red Flag was developed by Maj. Moody Suter to simulate the first 10 combat missions pilots would face. (U.S. Air Force photo by Master Sgt. Burt Traynor)