U.S. Soldiers assigned to Bravo Troop, 1st Squadron, 33rd Cavalry Regiment, 3rd Brigade Combat Team, 101st Airborne Division return from clearing a field with the help of a bomb sniffing military working dog in the Shamul district of Khost province, Afghanistan, March 31, 2013. Afghan Uniform Police officers led the mission of clearing villages suspected of possible insurgent activity. (U.S. Army photo by Spc. Brian Smith-Dutton/Released)