A Combat Arms observer watches down range as U.S. Air Force Staff Sgt. Robert Cerami, 307th Security Forces Squadron, fires an M240 machine gun during the Global Strike Challenge Weapons Firing competition, Sept. 24, 2014, Camp Guernsey, Wyo. The Global Strike Challenge is the world's premier bomber, Intercontinental Ballistic Missile, helicopter operations and security forces competition with units from Air Force Global Strike Command, Air Combat Command, Air Force Reserve Command and the Air National Guard. (U.S. Air Force photo by Master Sgt. Greg Steele/Released)