U.S. Marines and Navy service members carry their improvised charges to a designated detonation area during advanced joint explosion demolition training at Arta Range Complex, Djibouti, Dec. 30, 2013. The U.S. Marine Corps and Navy teamed up to increase their demolition skills by detonating improvised charges built from scraps of material. (U.S. Air Force photo by Senior Airman Tabatha Zarrella/Released)