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The U.S. military is developing fuel technology to extend the life of its global surveillance satellites. The Defense Advanced Research Projects Agency (DARPA) -- the U.S. Department of Defense's central research and development agency -- is working with Wallingford, Conn.-based Proton Energy Systems on a program to develop a self-regenerating fuel loop that would use water and solar power to create electricity onboard in-orbit spacecraft. However, questions have been raised in Congress about whether DARPA is focused sufficiently on R&D projects that would be most beneficial to a nation currently at war.