Crew chiefs assigned to the 28th Aircraft Maintenance Squadron ensure all systems are sound on a B-1 bomber prior to a mission at Ellsworth, S.D., March 18, 2014. Aircrews from Ellsworth flew several B-1 bombers to a forward operating location is Southwest Asia, replacing aircraft due for scheduled maintenance. (U.S. Air Force photo by Airman 1st Class Rebecca Imwalle /Released)