Airman 1st Class Cody Whitson, 28th Aircraft Maintenance Squadron crew chief, secures a hubcap to a B-1 tire with safety wire at Ellsworth Air Force Base, S.D., Oct. 24, 2013. Whitson learned how to perform a brake replacement as part of scheduled maintenance under the watchful eye of his trainer. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)