Sailors assigned to a destroyer flotilla with the navy under the PLA Southern Theater Command make preparations prior to an astern replenishment-at-sea with another vessel during a round-the-clock maritime training exercise on such subjects as live-fire operation, alongside replenishment-at-sea, ship maneuvering and so forth, in waters off the South China Sea in late May, 2019. (eng.chinamil.com.cn/Photo by Li Wei)
Source：China Military Online
