UNSC Tharsis (Reach)

Were you looking for the UNSC Tharsis'', the ship of the same name destroyed at the Second Battle of Harvest?

UNSC Tharsis was a destroyer in the UNSC Navy. Tharsis was present during the Fall of Reach, where it was heavily damaged, although one of its fusion reactors remained intact. The Covenant moved the destroyer's hulk to the "graveyard" they established over Reach's northern pole.

When the UNSC-controlled Ascendant Justice returned to Reach following the Battle of Installation 04, Cortana considered merging the Tharsis with the captured Covenant vessel. However, ultimately the frigate was selected based on that ship's better condition and intact MAC gun.

Trivia

 * Tharsis is a volcanic plateau on Mars which derived its name from a biblical reference.