U.S. Marine Corps 1st Sgt. Roberto Alviso, front right, with Fox Company, 2nd Battalion, 5th Marine Regiment, Regimental Combat Team 6, reads a Navy and Marine Corps Achievement Medal award certificate on Forward Operating Base Shir Ghazay, Helmand province, Afghanistan July 28, 2012. The award was presented to Sgt. Brain Clark for the superior performance of his duties while serving as a Police Sergeant.