Staff Sgt. Richard Burton, 28th Aircraft Maintenance Squadron electro-environmental technician, prepares a B-1 bleed air duct for installation during a 1,800 day maintenance inspection on Ellsworth Air Force Base, S.D., March 20, 2013, during an Operational Readiness Exercise. 28th AMXS Airmen are responsible for keeping Ellsworth’s B-1 fleet fully operational and ready to respond to contingency operations around the world. (U.S. Air Force photo by Airman 1st Class Kate Thornton-Maurer/Released)