U.S. Marine Corps Lance Cpl. Shaine Guarino, a rifleman with 1st Battalion, 9th Marine Regiment, participates in training on Camp Leatherneck, Helmand province, Afghanistan, Dec. 20, 2013. The training was performed to teach the Marines to properly mark improvised explosive devices during a patrol. (Official Marine Corps Photo by Lance Cpl. Zachery B. Martin/Released)