A B-1 bomber taxis during a Combat Hammer exercise at Ellsworth Air Force Base, S.D., Nov. 4, 2015. Combat Hammer is designed to operationally assess and evaluate the reliability, maintainability and accuracy of precision-guided and high technology air-to-ground munitions through tactical deliveries against simulated enemy defenses. (U.S. Air Force photo by Airman 1st Class Denise M. Nevins/Released)