U.S. Air Force Tech. Sgt. Christopher Duhe, 307th Aircraft Maintenance Squadron crew chief, adds liquid oxygen to a B-52 Stratofortress at RAF Fairford, England, Sept. 10, 2019. This maintenance requires special protective gear and attention to detail. Duhe was one of several Reserve Citizen Airmen from the 307th AMXS supporting Exercise Ample Strike 19 and Exercise Cobra Warrior. (U.S. Air Force photo by Master Sgt. Ted Daigle)