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US Marine MK-58 Hawker Hunter fighter jets (R) fly over an assault amphibious vehicle (AAV) during an amphibious landing exercise as part of annual joint US-Philippines naval exercises facing the South China Sea at a naval training center in San Marcelino, north of Manila on October 9, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said. AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)

US Marine MK-58 Hawker Hunter fighter jets (R)  fly over an assault amphibious vehicle (AAV) during an amphibious landing exercise as part of annual joint US-Philippines naval exercises facing the South China Sea at a naval training center in San Marcelino, north of Manila on October 9, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said.     AFP PHOTO / TED ALJIBE        (Photo credit should read TED ALJIBE/AFP/Getty Images)