Mississippi National Guard member Staff Sgt. Robert

Mississippi National Guard member Staff Sgt. Robert E. Krebs, 26, from Ocean Springs, Miss., brings rope to descend into a karez in Zabul province, Afghanistan, Dec. 14, 2012. Krebs is the noncommissioned officer in charge of security forces for the Zabul Agricultural Development Team’s Mescal Detachment. The Zabul ADT helps villages in the Tarnek wa Jaldak district of Zabul province inspect their karez systems for damage and then loans the villages the equipment needed for repairs. A karez is a system of underground channels that carry water from the aquifer at higher elevations to areas down slope. (U.S. Army Photo by Sgt. Lori Bilyou)