Airmen of the 28th Civil Engineer Squadron Fire Department gear up for a mobile aircraft arresting system test during the Phase II portion of an operational readiness exercise at Ellsworth Air Force Base, S.D., July 11, 2013. The MAS test ensures Fire Department personnel are able to reel the arresting system back in a timely manner for future aircraft to be able to use the system. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)