Sgt. Nathan Anderson, 339th Military Police Company's 2nd Platoon, 2nd Squad leader, of Indianapolis, stands stays alert after performing a building search during a mission. The 339th is attending CSTX 91 13-01 acting out notional scenarios based on real world activities. The Combat Support Training Exercise 91 13-01 is planned and coordinated by the 91st Training Division (Operations) at Fort Hunter Liggett, Calif. CSTX gives participating units and opportunity to rehearse military maneuvers and tactics such as base security, convoy operations, and battle reaction drills during simulated enemy attacks as well as apply their Military Occupational Specialty skills in a theater of operations. The exercise provides realistic training to units to successfully meet the challenges of an extended and integrated battlefield.