Senior Airman Cody Patterson, 28th Aircraft Maintenance Squadron crew chief, trains Airman 1st Class Oren Carr, 28th AMXS crew chief, on how to perform a brake replacement on a B-1 bomber at Ellsworth Air Force Base, S.D., Oct. 24, 2013. Ellsworth crew chiefs routinely check and maintain the brakes of all B-1 bombers to ensure they are serviceable. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)