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)
Source：China Military Online
