Marines with U.S. Marine Corps Forces, Special Operations Command, walk through a village with Afghan role players during a pre-deployment exercise at the National Training Center, Fort Irwin, Calif. May 15, 2011. The three-week exercise is designed to prepare MARSOC Marines for deployment to combat operations in Afghanistan by immersing them in an environment as realistic and comprehensive as possible. - Marines with U.S. Marine Corps Forces, Special Operations Command, walk through a village with Afghan role players during a pre-deployment exercise at the National Training Center, Fort Irwin, Calif. May 15, 2011. The three-week exercise is designed to prepare MARSOC Marines for deployment to combat operations in Afghanistan by immersing them in an environment as realistic and comprehensive as possible.