Tech. Sgt. Mark Wight, 28th Aircraft Maintenance Squadron crew chief, replaces safety wire on a B-1B Lancer’s landing gear on Ellsworth Air Force Base, S.D., Sept. 8, 2011. Wight was receiving B-1 specific training to prepare him to compete in the Global Strike Challenge. The event is designed for teams from each bomber and missile wing to develop highly-disciplined Airmen, build esprit de corps, and recognize the best of the best Airmen. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)