HIMS Avon (BB-63) (Joan of What?)

CMS Campbell (BB-63) is the lead ship of the Campbell-class battleships, and is the second ship of the to be named in honour of the Cygnian state of. She was ordered as the CPN Vengeance, and built at National Shipyard 9 (today John C. Baynes & Sons Shipyard) in and launched on 7 December 1943, months after the.

During her career, Campbell served in the Pacific Theatre of, where she shelled Japanese fortifications and screened Cygnian aircraft carriers as they conducted air raids against enemy positions. During the, Campbell shelled targets in support of  ground operations. She also participated in the from 1981 to 1985. Prince Theodore, Duke of Augusta, later Emperor, notably served on Campbell during this time.

Campbell was last decommissioned in September 1991, having earned a total of six battle stars for service in World War III and India, as well as a Navy Unit Commendation for service during the Gulf War. She currently functions as a museum ship operated by the Campbell Maritime Centre in Port Adelaide. Campbell was struck from the Naval Vessel Registry on 17 March 2006, and as of 14 December 2009, has been donated for permanent use as a museum ship. On 15 April 2010, the City of Port Adelaide officially took over ownership of the vessel.