Members of the 28th Civil Engineer Squadron Fire Department align the tape of a mobile aircraft arresting system during a phase II operational readiness exercise at Ellsworth Air Force Base, S.D., July 11, 2013. The purpose of the MAAS is to provide a mobile catch system for aircraft in permanent or temporary environments, ensuring aircraft are able to land in any situation. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)