The guided-missile frigates Dali (Hull 553) and Chenzhou (Hull 552) attached to a naval frigate flotilla under the Chinese PLA Southern Theater Command conduct double-banking operations at sea during a training exercise in middle May, 2025. (eng.chinamil.com.cn/Photo by Cai Shengqiu) The guided-missile frigates Dali (Hull 553) and Chenzhou (Hull 552) attached to a naval frigate flotilla under the Chinese PLA Southern Theater Command conduct double-banking operations at sea during a training exercise in middle May, 2025. (eng.chinamil.com.cn/Photo by Cai Shengqiu) 