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Secretary of the Navy (SECNAV) Ray Mabus delivers the keynote address at the National Clean Energy Summit 4.0 in Las Vegas.
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LAS VEGAS (Aug. 30, 2011) Secretary of the Navy (SECNAV) Ray Mabus delivers the keynote address at the National Clean Energy Summit 4.0 in Las Vegas. The summit brought together leaders of industry, government, and research and development to chart the course for the future of energy in America. (U.S. Navy photo by Chief Mass Communication Specialist Sam Shavers)

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