The guided-missile destroyers Lanzhou (Hull 170) and Changsha (Hull 173) attached to a destroyer flotilla of the South China Sea Fleet under the PLA Navy steam in formation during a live-fire training exercise in waters of the South China Sea on May 15, 2017. The guided-missile frigate Sanya (Hull 574) and the guided-missile destroyer Hefei (Hull 174) also participated in the training. (Photo/eng.chinamil.com.cn)
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