M313 Elephant

Overview
Little is known about this UNSC vehicle at present. Described as a Jawa Sandcrawler, it is the UNSC's equivalent to the Covenant's Scarab. Rumors say that the Elephant will be the size of a 3 story building (24 - 42 feet in height) and will have a multitude of different weapons on it such as AIE-486H Heavy Machine Guns, Missile Pods, and some sort of super weapon (probably similar to the Scarab's main gun). Twelve soldiers can ride in it, it can house a Mongoose under its belly, its drivable, has a turret (possibly a AIE-486H Heavy Machine Gun), can respawn troops, and holds both the flag and the capture point. In the picture on the right, if you look very closely at the top of the Elephant, you will see an Elite controlling a turret of some sort. This is most likely to be the LAAG turret.

Use
Only available in Sandtrap as of now, and is the only thing specifically mentioned not to be included in Forge. It will most likely appear in a special game type where they're two teams (offensive and defensive) and the offensive teams's goal is to destroy the Elephant using vehicles and heavy weapons. The defensive team however, will have to use the Elephant to hold off the enemy in the alotted time. It is expected to make it's debut in Halo 3. We await further, more conclusive evidence before expanding upon this article.