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Official U.S. Navy file photo of guided-missile cruiser USS Princeton (CG 59) pulling alongside the military sealift command fleet replenishment oiler USNS Henry J. Kaiser (T-AO 187) to refuel at sea with biofuel during The Great Green Fleet demonstration portion of the Rim of the Pacific (RIMPAC) 2012 exercise. Princeton took on a 50-50 blend of advanced biofuel and traditional petroleum-based fuel.
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