The M28 Gorilla Heavy Reconnaissance Vehicle, also known as the M28 or Gorilla, is a large vehicle used by the UNSC's Army, Marine Corps, and Naval special operations. Notable for its combination of size and speed, the Gorilla is often considered the larger younger brother of the Warthog. Two notable differences, however, are that the Gorilla has an enclosed cockpit and that the gunner's protective plate has changed from a metal plate to an advanced energy shield. When in heavy combat situations, this shield can expand to protect a greater circumference of the gunner, though the shield will eventually collapse. As with the Gorilla's predecessor, the Kodkod, the vehicle bears an emergency shielding system as well as a cramped albeit helpful troop bay under the turret.