The UNSC The Heart of Midlothian (DD-366) was a Warrior-class heavy destroyer of the United Nations Space Command. Originally planned as the UNSC Cornwallis, DD-366 was instead named for a Colonial Military Administration auxiliary vessel that was destroyed in battle; the CMA The Heart of Midlothian had used its hull to intercept missiles heading towards an unarmed colony ship, sacrificing it and its crew and saving more than 2,000 colonists.