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09/14/2010 03:59 pm ET | Updated May 25, 2011

U.S. Army Deploys Solar Power Backpacks In Afghanistan

The legendary competition between the branches of the U.S. armed forces has taken on a sustainable twist. Take portable solar power, for example. The Marines just introduced a portable solar power system this spring, and a few weeks later the Air Force kicked in with a portable solar system of its own. Now the U.S. Army has entered the fray with a portable battery recharging kit called the Rucksack Enhanced Portable Power System (REPPS), which features a 62-watt solar panel "blanket" tucked into a backpack. The system was just deployed in Afghanistan this summer.

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