Warthog is a generic term for a series of UNSC ground vehicles. These light reconnaissance vehicles sacrifice technology for flexibility and reliability. The Warthog is affectionately known as the 'Hog' by UNSC soldiers.

NOTE: The Warthog underwent a major series of changes between Halo 1 and Halo 2. Indestructible in its first iteration and coming in only one flavor, with the rear-mounted LAAG cannon, Halo 2 saw the Warthog become destructible and boardable, like all vehicles, and gained the Gauss cannon variation previously only seen in the port of Halo 1 for the Mac and PC. The specialized variations for various terrain, or those designed to carry more soldiers, appear to be forever relegated to the scrapbook.

The control and feel of the vehicle was also significantly different, with the H2 version far grippier and less likely to slide through corners, although perhaps just as likely to flip.

No word here on what mounted weapons we can expect, although I'd be hoping the Gauss returns. Text on Bungie.net that referred to a LAAG cannon that could be temporarily removed from a Warthog to serve as a turret seems to have been merely flavor text not designed to describe gameplay features.