Led by the guided-missile frigate Yongzhou (Hull 628), a frigate flotilla with the navy under the PLA Southern Theater Command steams in formation in an undisclosed sea area during a maritime training exercise in early December 2020. (eng.chinamil.com.cn/Photo by Chen Tanggui)

Led by the guided-missile frigate Yongzhou (Hull 628), a frigate flotilla with the navy under the PLA Southern Theater Command steams in formation in an undisclosed sea area during a maritime training exercise in early December 2020. (eng.chinamil.com.cn/Photo by Chen Tanggui)

Sailors assigned to a frigate flotilla with the navy under the PLA Southern Theater Command stand in positions and heave a mooring line in preparation for a replenishment-at-sea operation during a maritime training exercise in early December 2020. (eng.chinamil.com.cn/Photo by Chen Tanggui)

A sailor assigned to a frigate flotilla with the navy under the PLA Southern Theater Command fires a heavy machine gun aboard the guided-missile frigate Yongzhou (Hull 628) during a maritime training exercise in early December 2020. (eng.chinamil.com.cn/Photo by Chen Tanggui)