U.S. Air Force Airmen with the 455th Expeditionary Civil Engineer Squadron prepare to pour concrete on the flightline at Bagram Airfield, Afghanistan May 22, 2014. The 455 ECES ensures operability of the airfield by providing airfield maintenance, construction and operation for the senior airfield authority mission. (U.S. Air Force photo by Staff Sgt. Evelyn Chavez/Released)