U.S. Air Force Staff Sgts. Scott Emmick and Byran Bowermaster, assigned to the 379th Expeditionary Security Force Squadron dog handlers, conduct muzzle training with Chrach, a military working dog assigned to the 379th Air Expeditionary Wing, in Southwest Asia, Dec. 30, 2013. MWDs are used for patrol and explosive detection and specialized mission functions. (U.S. Air Force photo/Senior Airman Hannah Landeros)