Mongoose
From Halopedia, the Halo wiki
This vehicle did not make it into the final version of Halo 2, but are showed in the "behind-the-sceens" video on the Limited Edition version of Halo 2.
The Marine's speediest vehicle is the Mongoose All-Terrain Vehicle. Essentially four wheels and an engine, this ATV can travel very fast over nearly all types of terrain. With no weapons on board, the drive must use his own weapons for defense, though this means taking one hand away from the vehicle's already precarious controls.
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