U.S. Air Force Senior Airman Brandon Perry, an Aircrew Flight Equipment technician, assigned with the 509th Operation Support Squadron, performs preventative maintenance on an oxygen supply tube, at Andersen Air Force Base, Guam, Aug. 9, 2016. Approximately 200 Airmen and three B-2s from Whiteman Air Force Base, Mo., deployed here in support of U.S. Strategic Command’s Bomber Assurance and Deterrence mission. (U.S. Air Force photo by Tech. Sgt. Miguel Lara III)