In this photo taken Wednesday, July 18, 2012, U.S. Navy Secretary Ray Mabus answers a question during a press conference aboard the USS Nimitz aircraft carrier. The U.S. Navy is using its Rim of the Pacific exercises to test whether aircraft and sea vessels run the same using fuels made up of biofuel blends rather than traditional petroleum. (AP Photo/Oskar Garcia)

Associated Press
In this photo taken Wednesday, July 18, 2012, U.S. Navy Secretary Ray Mabus answers a question during a press conference aboard the USS Nimitz aircraft carrier. The U.S. Navy is using its Rim of the Pacific exercises to test whether aircraft and sea vessels run the same using fuels made up of biofuel blends rather than traditional petroleum. (AP Photo/Oskar Garcia)
In this photo taken Wednesday, July 18, 2012, U.S. Navy Secretary Ray Mabus answers a question during a press conference aboard the USS Nimitz aircraft carrier. The U.S. Navy is using its Rim of the Pacific exercises to test whether aircraft and sea vessels run the same using fuels made up of biofuel blends rather than traditional petroleum. (AP Photo/Oskar Garcia)
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