Elephant

The M312 Heavy Recovery Vehicle, sometimes refered to as the Behemoth-class Troop Transport and commonly known as the Elephant, is a heavy UNSC Marine Corps Mobile Assault, Support, and Recovery Platform.It appears exclusively in Halo 3s multiplayer map Sandtrap, as a civilian variant in Halo 3: ODST and as a unit in Halo Wars.

The Elephant seems to serve a similar role to the Shadow of Halo 2 albeit much slower, sturdier, larger, damage resistant, and less maneuverable.