U.S. Army Spc. Adam Zettel, with the 49th Mine Dog Detection Detachment, and Allan, a mine detection dog, search a compound for unexploded ordnance in Qalat, Zabul province, Afghanistan, April 18, 2011. The team was asked to perform a ground sweep of the compound prior to the start of a forward operating base (FOB) expansion project for FOB Smart, which is home to Zabul Provincial Reconstruction Team. (U.S. Air Force photo by 1st Lt. Brian Wagner/Released)