Airmen assigned to the 28th Aircraft Maintenance Squadron prepare B-1 bombers for flight during the Operational Readiness Exercise at Ellsworth Air Force Base, S.D., Feb. 24, 2012. The ORE tested how effectively and efficiently Ellsworth is able to mobilize and process personnel and assets during wartime contingencies. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)