Staff Sgt. Amaris Serrano, 28th Security Forces Squadron Base Defense Operations Center controller, observes during the tactical recapture portion of the 2015 Global Strike Challenge security forces competition at Camp Guernsey, Wyo., Sept. 24, 2015. Airmen used windows as vantage points to survey locations prior to entering an enemy-occupied town. (U.S. Air Force photo by Senior Airman Brandon Valle/Released)