Io-class Gunboat

undefined "Damn powerful little buggers. Four of these held of a Delta Charlie Charlie on UNSC borders."

- Anonymous marine referring to Thor-class.

The  was a high tonnage corvette operated primarily by the United Nations Space Command Navy. It was used as a patrol, planetary defence, light conventional warfare, and orbital assault vessel of said navy from the 2580's through 2623 when the Io's service was abruptly ended by the arrival of new technologies.