Lance Cpl. Carl Sanchez, a rifleman with Lima Company,

Lance Cpl. Carl Sanchez, a rifleman with Lima Company, 3rd Battalion, 3rd Marine Regiment, uses a mine detector to sweep the area around a simulated casualty during Exercise Clear, Hold, Build 1 on Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Aug. 4, 2011. The three-day CHB-1 evolution is part of the 35-day Enhanced Mojave Viper training exercise. During EMV, the Marines of 'America's Battalion' are training to kill enemy fighters by solidifying infantry skills and practicing counterinsurgency operations. They're preparing for an upcoming fall deployment to Afghanistan's southernmost Helmand province, where they'll support Operation Enduring Freedom. Sanchez, 19, is from Fresno, Calif.