The guided-missile destroyer Changsha (Hull 173) fires its close-in weapons system at mock aerial targets during a training exercise in late February, 2019. A destroyer flotilla composed of several guided-missile destroyers including Changsha (Hull 173) and Lanzhou (Hull 170) with the navy under the PLA Southern Theater Command recently conducted a three-day maritime training exercise in waters of the South China Sea. (eng.chinamil.com.cn/Photo by Yu Lin)