Chinese missile destroyer "Xi'an" leaves the Pearl Harbor in Hawaii, the United States, July 12, 2016. The Chinese fleet of missile destroyer "Xi'an", missile frigate "Hengshui" and supply ship "Gaoyou Lake" left the Pearl Harbor for the at-sea phase of the Rim of the Pacific (RIMPAC) exercise 2016 on Tuesday. [Photo: Xinhua/Yang Lei]