Airmen from the 28th Bomb Wing line-up on the flightline during the wing’s Foreign Object Debris walk at Ellsworth Air Force Base, S.D., Aug. 18, 2014. FOD walks ensure that all rocks, screws, or any misplaced items are cleared from the runway to prevent damage to aircraft engines. (U.S. Air Force photo by Senior Airman Zachary Hada/Released)