Mongoose

The M274 Ultra-Light All-Terrain Vehicle (abbreviated M274 ULATV), commonly known as the Mongoose, is a United Nations Space Command light ground reconnaissance vehicle designed by AMG Transport Dynamics. The Mongoose lacks weapons, but can carry a driver and a passenger. The passenger can fire their weapon, but they will not be able to zoom in.

Overview
The M274 Mongoose ULATV is one of the fastest and most maneuverable ground vehicles in the arsenal of the UNSC Marine Corps. It is a highly effective vehicle for reconnaissance, rapid transportation, swift tactical versatility, and for shooting between positions. A smaller cousin to the ubiquitous M831 Troop Transport, the Mongoose is a small ATV capable of carrying a driver in the middle of the vehicle, and features a rear platform that can be used to carry one additional passenger. Because it carries no armament of its own, having a passenger is usually essential if engaging in a combat zone. Due to its smaller size, the Mongoose is a difficult target for both slow and fast moving enemy weaponry, as opposed to the Warthog, whose size is somewhat substantial. However, one should note: It's a common misconception that this ULATV is faster than any other ground vehicle in Halo 3, when the M12 LRV Warthog is actually faster (this is due to the different camera angle between the two, as well as the Mongoose's better acceleration).

The Mongoose's high speed, light mass, and practically non-existent armor make it unwieldy and difficult to control at high speeds and/or over unstable terrain, making the ULATV vulnerable to destabilization, crashes, and flips. To make matters worse, the design of the vehicle and its lack of armor leave both the driver and passenger completely exposed. Furthermore, the Mongoose does not incorporate any offensive or defensive capabilities, making the Mongoose's only practical defenses an armed passenger and it's speed. Thus, the standard UNSC Marine Corps operating protocol in engagements against Covenant forces is to place a M41 Rocket Launcher-armed Marine in the passenger position to fire rockets against slow-moving hostile vehicles, while the driver uses the Mongoose's superior speed to evade enemy return fire. In a last resort situation, the Mongoose can be used to run over nearby enemies. Yet, attempting a splatter is usually an ineffective plan: The low width and height of the vehicle, combined with the aforementioned instabilities when driving, make it very difficult to successfully score an impact on an opponent.

For quick and practical deployment, the Mongoose can be transported by the Pelican dropship or the Behemoth-class Troop Transport (Elephant). Additionally, the AV-14 Attack VTOL appears to have a winch capable of transporting the ULATV, but it is not seen used during gameplay.

Finally, this vehicle is considered to be analogous to the Covenant Type-32 "Ghost" Rapid Assault Vehicle, despite the offensive, defensive, and performance differences.