The UNSC Odysseus was a modified Phoenix-class support vessel in service with the UNSC Navy. Built in 2483, Odysseus was a colony ship until she was recommissioned by the UNSC into a support vessel in 2525. In 2530 she was converted into a battleship in answer of the Navy's desperate need for warships and placed under the command of then-Rear Admiral Amelia Corrigan and served as her flagship for years as part of Battlegroup Whiskey-3.