Airmen from the 28th Aircraft Maintenance Squadron perform maintenance on a B-1 bomber during Combat Hammer at Ellsworth Air Force Base, S.D., Feb. 12, 2015. B-1 aircrews from the 37th Bomb Squadron employed GBU-54 Laser Joint Direct Attack Munitions against moving targets during the Air Force air-to-ground Weapon System Evaluation program. (U.S. Air Force photo by Senior Airman Hailey R. Staker/Released)