What is the name of the UNSC ship featured in the campaign of Halo Wars?

The UNSC ship featured in the Halo Wars campaign is the Spirit of Fire.

The Spirit of Fire is a colony support ship converted for military service. Its crew, led by Captain James Cutter, investigates Covenant activity and becomes involved in a conflict linked to ancient Forerunner technology. The ship serves as the campaign’s mobile headquarters and transports the UNSC forces commanded by the player.

Halo Wars is set in 2531, 21 years before the events of Halo: Combat Evolved. The ship’s crew includes Sergeant John Forge, Professor Ellen Anders and artificial intelligence Serina. The Spirit of Fire later becomes important in Halo Wars 2, whose story follows its return after a long period missing in space. It is distinct from the Pillar of Autumn, the UNSC cruiser central to the first Halo game.