Mike Raybon, Joint Direct Attack Munition specialist from Eglin Air Force Base, Fla, assists 28th Munitions Squadron conventional maintenance members with attaching a tail fin onto a GBU-54 as part of a training exercise on Ellsworth Air Force Base, S.D., April 18, 2012. The tail fin stabilizes the GBU-54 to precisely guide it to its target. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)