Conventional maintenance members assigned to the 28th Munitions Squadron train to assemble GB-54 laser guided Joint Direct Attack Munitions on Ellsworth Air Force Base, S.D., April 18, 2012. The GBU-54 is a 500 pound precision strike, global position satellite guided weapon that delivers deadly accurate strikes against both moving and stationary targets. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)