UNSC Swiftsure (CG-389) was a Marathon-class cruiser in service with the UNSC Navy during the Human-Covenant War. Swiftsure was commissioned in 2545, and received its name from the Ark Royal-class space cruiser HMS Swiftsure, the last vessel to be commissioned into the Royal Navy. Swiftsure served throughout the last years of the war before being destroyed in the opening moments of the Battle of Tribute in late August 2552.