U.S. Air Force Technical Sgt. Keith Jackson, a crew chief assigned to the 343rd Expeditionary Bomb Squadron, performs pre-flight maintenance on a B-52 Stratofortress at RAF Fairford, United Kingdom, Sept. 7, 2018. Jackson was helping to prepare the jet for the first bomber flight of Ample Strike 18. The Czech Republic-led exercise is designed to enhance the training of 18 other NATO allies and partners involved. (U.S. Air Force photo by Master Sgt. Ted Daigle/ released)