From Halo Bulletin 8-15-12:

Operator Specialization: Spartan optimization for the operation and control of a wide-range of vehicles; space, air, ground, and sea.

Wheelman Armor Mod: The Wheelman armor mod gives Spartans the skill to coax every bit of stamina and durability out of vehicles they are piloting.

Wheelman armor – which features cylinder packs that could be preplaced with more oxygen or cooling material depending on the mission – makes you suffer the negative effects of an overcharged Plasma Pistol burst for less than the normal time. Vehicles you drive are also more durable over a longer period of time. You can still get hijacked, but the window for that is smaller.

HFFL’s thoughts:

Objective: Wheelman/Driver boost-take slower damage to the vehicle you are currently driving

Subjective: AWESOME! This is a Wheelman’s dream! Couple this with another who has the “Pathfinder” mod on and your hog gets a LOT stronger. This mod is definitely one I’ll use time and again as I love driving people to perfections. This is going to just make it that much easier!

Armor: For those of you who wanted a Noble 1 “Carter”/Security/Gear of War armor set, this is for you. I mean that actually as a compliment. I really REALLY like this armor set. One of only two of the specializations that have a larger visor. This set feels and looks more spartan to me than most of the others, even with those “Gears-like” circles on the chest.

Emblems: IHmm, not enough “Gears of War” references? Well then take a look at the emblems for this mod. Two clearly have gears in them. The bottom is a gear, just with a lot more “teeth” than normal. Again, though, this isn’t at all a knock on the emblems. In fact I can see this set of armor being worn by “Gears” fans who also play Halo. So it’s all good.