The scorpion is the Halo universes tank. The Scorpion boasts a main gun that takes a few seconds to reload, a turret (both can turn a full 360 degrees), and can allow passengers up to four to sit on the sides of it. There different version of the tank through the franchise. In the First Halo, the cockpit of the Scorpion was open so while in multiplayer, some can shoot out or snipe the player. In Halo 2 it was then closed making it difficult to kill in multiplayer. You either needed a rocket launcher or a few player converging on the tank. And In Halo 3, the driver was not in control of the turret/ A extra player needed to man the turret.