Master Sgt. Jorge Carrillo, staff non-commissioned officer-in-charge at Marksmanship Training Battalion aboard Marine Corps Base Quantico, Virginia, fires an M72 Light Anti-Tank Weapon, one of the new additions to the Indoor Simulated Marksmanship Trainer III. The ISMT III adds three new weapons, 3-D imagery, and enhanced training modes, giving Marines a better, more realistic training experience as they prepare for the complexities of modern warfare. (U.S. Marine Corps photo by Ashley Calingo) - Master Sgt. Jorge Carrillo, staff non-commissioned officer-in-charge at Marksmanship Training Battalion aboard Marine Corps Base Quantico, Virginia, fires an M72 Light Anti-Tank Weapon, one of the new additions to the Indoor Simulated Marksmanship Trainer III. The ISMT III adds three new weapons, 3-D imagery, and enhanced training modes, giving Marines a better, more realistic training experience as they prepare for the complexities of modern warfare. (U.S. Marine Corps photo by Ashley Calingo)