A computer simulation program that measures equipment weight, distribution and effects on body mechanics and performance is being given to the Marine Corps.

Modern-day warfighters face heavy—literally—odds on the battlefield, as they often carry more than 100 pounds of gear, including body armor, weapons and night-vision technology. Such loads can slow them down, reduce agility and result in fatigue, joint sprains or long-term ailments like arthritis or chronic back problems.