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How Four Technologies Will Carry The Weight Of War

• http://www.popsci.com

Shortly after iron swords and spearheads became common, soldiers in sixth-century Greece ran into a problem. Infantrymen carted around breastplates, helmets, bronze-lined wooden shields, and iron-tipped spears—as much as 70 pounds of extra weight. The loads were so intolerable that soldiers routinely abandoned them on the battlefield. The famous Spartan phrase "Come back with your shield or upon it" was not meant to inspire valor. It was a directive to stop troops from ditching essential equipment.

Since then, machine guns have replaced heavy javelins, but the weight soldiers carry into war has remained stubbornly consistent: Today, as in Roman times, the average foot soldier lugs about 55 percent of his bodyweight into combat. And though Kevlar is much lighter than bronze, new field tools such as radios, night vision goggles, and all the batteries necessary to power modern war have offset any lightening of loads.

That's a significant issue. "The ability to move is directly related to the ability to survive," says Lee Mastroianni, program manager at the Office of Naval Research. During the D-Day invasion of Normandy in World War II, for example, many U.S. Army soldiers drowned while attempting to wade ashore with 90 pounds of gear.

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