MARJAH, Helmand province, Islamic Republic of Afghanistan – Corporal Mark Hickok, a 23-year-old combat engineer from North Olmstead, Ohio, patrols through a field during a clearing mission April 9. Marines with Company B, 1st Tank Battalion, learned basic route clearance techniques from engineers like Hickok, who are deployed with 1st Combat Engineer Battalion. (U.S. Marine Corps photo by Cpl. John M. McCall)