The USS Nimitz, a nuclear-powered aircraft carrier which is currently supplemented by biofuel, sails about 150 miles north of the island of Oahu during the RIMPAC Naval exercises off Hawaii in this ... more 
The USS Nimitz, a nuclear-powered aircraft carrier which is currently supplemented by biofuel, sails about 150 miles north of the island of Oahu during the RIMPAC Naval exercises off Hawaii in this file photo from July 18,2012. The Nimitz and four other ships in its strike group moved into the Red Sea early September 1, 2013, U.S. defense officials said, describing the move as "prudent planning" in case the ships are needed for military action against Syria. REUTERS/Hugh Gentry/Files (UNITED STATES - Tags: MILITARY ENERGY BUSINESS MARITIME ENVIRONMENT) less 
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Reuters | Photo By HUGH GENTRY / REUTERS
Mon, Sep 2, 2013 10:19 AM EDT