A real warthog has been designed, created, and used by Bungie LLC for Arms Race, a Halo 3, Live Action, video, aired on the Discovery Channel in 2007.
The Warthog, in general, is one of the most popular vehicles in the Halo series. It is mounted with a light, 3-barreled anti-aircraft Gatling Gun on a turning stand.
Warthog image from The Warthog with a Machine Gun was the first warthog to be created for the finished game product, followed by the Rocket Warthog. Pelican image from The HPelican is the Pelican from Halo: Combat Evolved campaign. The original Pelican has only a single Pilot seat, the actual Pelican design calls for two seats, a Pilot, and Co-Pilot. The Pelican is the human drop-ship with a passenger Cargo Bay designed to hold equipment and troops. The model is the aircraft you see the Master Chief escaping with in the 45465Pillar of Autumn with in the level 'The Maw'. Longsword Image from The HLongsword is the Campaign Longsword. Other versions of the Longsword have no Nuclear Bomb or Missiles, some even have a Machine Gun. It is a 5 person jet-like bomber with missile and nuclear bomb armaments. The Longsword was the aircraft Master Chief escaped the Pillar of Autumn on in Halo: Combat Evolved campaign. Civilian Warthog image from Warthog with mounted flamethrower halo3\ Vehicles List