Well if we can get unique names and appearances; I'll get to assigning some perks.
The Rough Riders
The 1st Volunteer Motorcycle Cavalry have recently distinguished themselves in the fighting in Atlanta, repeatedly coming to the aid of both their fellow Militia members, and the civilians they sought to protect. While some considered their maneuvers "reckless", the undeniable fact is, they worked.
Modeling themselves after the famed historical cavalry unit, they have taken to wearing khaki-colored clothes over their cobbled-together body armor, and several members have scrounged up actual sabers to use alongside their more modern firearms and explosives.
The Rough Riders pride themselves on "drive by" tactics, seeking to make repeated sweeps by an enemy target, using their speed to avoid attacks while also increasing the potency of their strikes. If given a choice between attacking an enemy or defending fleeing civilians, though, they will choose the latter every time.
They are also highly focused on physical fitness, and are striking up a strong friendship with Wojtek's Winners, formed around the bear cub mascot the artillery group have recovered.
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Ghost Riders
The 6th Volunteer Motorcycle Cavalry are a strange lot; some would describe them as "fatalistic", but they prefer the term "focused". Their members range a bit in personal philosophies and theologies, but all have a common strain: some sense of a "divine vengeance" against Evil. And wouldn't you know it, here come the Kaiju as personifications of Evil. Convenient, that.
The Ghost Riders like to try and tie down targets with ropes and chains, allowing them to use Molotov Cocktails and gasoline-based bombs to burn their targets to ash. A couple of their more...enthusiastic...members have scrounged up flamethrowers, which makes them a sight to see....
That's what I've got for now.