Canadian Navy's Frigate HMCS Ottawa (341) arrives at a pier of the Yangtze River in Shanghai, east China, May 26, for a 7-day friendly port visit. Frigate HMCS Ottawa (341) is one of the 12 Canadian-built Halifax-class multi-role patrol frigates which are considered the backbone of the Royal Canadian Navy (RCN). The frigate was originally designed for anti-submarine warfare and anti-surface warfare, primarily in the open ocean environment. (Photo/eng.chinamil.com.cn)