F-35 Lightning II fighter jets, assigned to the 6th Weapons Squadron, at Nellis Air Force Base, Nev., fly in formation over the Nevada Test and Training Range, Nev., July 10, 2017. The United States Air Force Weapons School teaches graduate-level instructor courses that provide the world's most advanced training in weapons and tactics employment to officers of the combat air forces and mobility air forces. (U.S. Air Force photo by Senior Airman Kevin Tanenbaum/Released)