After the events of Halo Wars, the UNSC secretly developed a "real" Warthog prototype, which was used by special forces. Its main function was a set of four unique magnetic field repulsors (one on each leg) that allowed it to be dropped via orbiting ships through the atmosphere. The repulsors shielded the vehicle from high temperatures while entering the atmosphere and slowed its speed as it reached the ground.
I tried to make the ammo feed look like a "curly hog tail."
The repulsors pads in the orbital-drop position.
Master Chief: "Since I'm so into being green, what kind of impact does the 'real' Warthog have on the environment?" Marine: "Well, have you ever seen a pig a few hours after it eats a lot?"