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U.S. Navy's amphibious assault vehicles with Philippine and US troops on board maneuver in the waters prior to storming the beach at a combined assault exercise at a beach facing one of the contested islands in the South China Sea known as the Scarborough Shoal in the West Philippine Sea Tuesday, April 21, 2015 at the Naval Education and Training Command at San Antonio township, Zambales province, northwest of Manila, Philippines. More than ten thousand troops from both the U.S. and Philippine militaries are taking part in the annual military drill that focuses on regional security, terrorism, disaster preparedness and inter-operability of both countries. (AP Photo/Bullit Marquez) Bullit Marquez/AP