The missile boats Chaoyang (Hull 755), Yangjiang (Hull 770), Fu'an (Hull 767), and Linwu (Hull 754) steam in formation during a realistic training exercise in an undisclosed sea area of the South China Sea on June 9, 2017. They are attached to a frigate flotilla with the South China Sea Fleet under the PLA Navy. (eng.chinamil.com.cn/Photo by Zhang Bin)