U.S. Air Force 1st Lt. Stephen Cary, 9th Bomb Squadron B-1B Lancer pilot, tests an oxygen mask prior to takeoff at Dyess Air Force Base, Texas, May 24, 2018. Members of the 7th Bomb Wing and 489th Bomb Group will be forward operating out of RAF Fairford, U.K., while taking part in training that provides opportunities for bomber crews to integrate and train with allies and partners from across the globe U.S. Strategic Command bomber units regularly train in support of geographic combatant commands, including U.S. European Command. (U.S. Air Force photo by Airman 1st Class Kylee Thomas)