During World War II the "Port of Belfast" was used by the Royal Navy as the home base for many of the ships that escorted Atlantic and Russian convoys including s of the 3rd Escort Group. is a First World War light cruiser permanently berthed in Belfast Harbour. It served as the training ship for some 130 reservists as the headquarters for the Ulster Division Royal Naval Reserve until it was decommissioned in 2011. After extensive restoration work, HMS Caroline opened to the public in June 2016 as a museum as part of the National Museum of the Royal Navy.