Six GBU-54 Laser Joint Direct Attack Munitions are transported on the flight line in preparation for loading into B-1 bombers for a Combat Hammer exercise at Ellsworth Air Force Base, S.D., May 12, 2012. The goal of the exercise was to evaluate the effectiveness, maintainability, suitability, and accuracy of precision guided munitions and other advanced air to ground weapons. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)