USS Salem is a Des Moines-class heavy cruiser built during World War II. By the time she was completed, the war was already over. This makes her the world's last heavy cruiser to enter service and the only still remaining. She has been preserved as a museum ship in Quincy, Massachusetts. This version of the ship includes a few changes from the historical version, all of which were either planned or eventually removed. This includes the addition of the bow dual 3" mount, which was removed due to poor performance in heavy seas. At the stern, floatplane catapults were added, however, historically these were never mounted.