Sailors wearing protective masks operate a combat direction system console to make data collection of a simulated infected sea area aboard the guided-missile frigate Xinyang (Hull 501) during a maritime training exercise in waters of the Yellow Sea in early March, 2020. They are assigned to a naval frigate flotilla under the PLA Northern Theater Command. (eng.chinamil.com.cn/Photo by Wang Guangjie)

The guided-missile frigate Xinyang (Hull 501) attached to a naval frigate flotilla under the PLA Northern Theater Command releases jamming shells for blinding the trailing missiles during a maritime training exercise in waters of the Yellow Sea in early March, 2020. (eng.chinamil.com.cn/Photo by Wang Guangjie)

Members of damage control team don various levels of Mission-Oriented Protective Posture (MOPP) gear and prepare fire hose aboard the guided-missile frigate Xinyang (Hull 501) during a damage control drill of a maritime training exercise in waters of the Yellow Sea in early March, 2020. They are assigned to a naval frigate flotilla under the PLA Northern Theater Command. (eng.chinamil.com.cn/Photo by Wang Guangjie)

The guided-missile frigate Xinyang (Hull 501) attached to a naval frigate flotilla under the PLA Northern Theater Command steams in waters of the Yellow Sea during a maritime training exercise in early March, 2020.(eng.chinamil.com.cn/Photo by Wang Guangjie)

The guided-missile frigate Xinyang (Hull 501) attached to a naval frigate flotilla under the PLA Northern Theater Command fires its main-gun against mock ashore targets during a live-fire operation of a maritime training exercise in waters of the Yellow Sea in early March, 2020.(eng.chinamil.com.cn/Photo by Wang Guangjie)