U.S Marines with Special Purpose Marine Air Ground Task Force tape over uley knots for an improvised claymore mine during advanced joint explosive 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)