28th Munitions Squadron mission systems technicians build a Mark-84 inert bomb during training in the conventional maintenance shop at Ellsworth Air Force Base, S.D., Nov. 7, 2012. The munitions squadron carefully inspects and assembles 1,707 munitions items to train for combat operations, ensuring that Ellsworth B-1s continue to fly successful missions. (U.S. Air Force photo by Airman 1st Class Kate Thornton-Maurer/Released)