A U.S. Navy helicopter prepares to take off from the USS Nimitz aircraft carrier while destroyer USS Chafee travels alongside on Wednesday, July 18, 2012. 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
A U.S. Navy helicopter prepares to take off from the USS Nimitz aircraft carrier while destroyer USS Chafee travels alongside on Wednesday, July 18, 2012.  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)
A U.S. Navy helicopter prepares to take off from the USS Nimitz aircraft carrier while destroyer USS Chafee travels alongside on Wednesday, July 18, 2012. 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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