Sailors manipulate the mooring lines to haul off buoy aboard the guided-missile frigate Baise (Hull 585) during a four-day maritime fully exercising qualification test in waters of the South China Sea from May 30 to June 2, 2019. They are attached to a frigate flotilla with the navy under the PLA Southern Theater Command. (eng.chinamil.com.cn/Photo by Cai Shengqiu)