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U.S. Navy Boatswain Mate 2nd Class Elizabeth Rodriguez, right, and Boatswain Mate 3rd Class Matthew Radcliff with Marine Corps Air Station (MCAS) Iwakuni Harbor Operations, guide a buoy through the water at MCAS Iwakuni, Japan, Nov. 7, 2017. Harbor Operations conducted facilities-response training to learn how to control potential oil or fuel spills in the waters surrounding the station. The buoys trap oily substances while a skimmer boat is used to filter and clean the water.