ELLSWORTH AIR FORCE BASE, S.D. -- Airman 1st Class Chris Dewald, 28th Aircraft Maintenance Squadron electrician, performs an operations check after replacing a part on a B-1B Lancer at Ellsworth Air Force Base, S.D., Jan. 19, 2011. Airmen from the 28th AMXS provide on-equipment maintenance to maintain the combat readiness of B-1s stationed here. (U.S. Air Force photo/Senior Airman Kasey Close)