After some more discussion with Zoythrus on IRC, here's some of what we came up with for the Cult's basic layout, plus a few things I thought of while typing it up. All names are place-holders.
Infantry - the basic soldier of the cult, armed with an AK-47, cheap and expendable
Rocket - rebel with a rocket launcher, anti-tank and anti-air
Dog - fast attack unit, detector
Lab
Launcher - guy with a grenade launcher, fires homemade napalm (anti-building) and gas grenades (anti-personnel)
Commando - elite mutant soldier with chamelon skin, SMG attack, blade attack allows him to stay cloaked, maybe a sabotage bomb
Shock trooper - Combine soldier analog, tough and mean, possible cyborg (resistant to bullets, weak to electricity)
Salvage yard
Technical - truck with a machine gunner in the bed, room for one passenger to fire out the window
Battle bus - armored van, firing ports for several passengers, may or may not have an attack of its own
Autogyro - flying junkyard contraption, scout vehicle, lightly armed (if at all), unarmored and open to the elements
Gungyro - upgraded gyro with a light armored shell and room for a passenger or two to shoot out of, maybe has a light machine gun of its own
Airboat - light naval transport
We also thought the UNSF needs a detector unit and figured a UAV would fit the bill. Like the real-life Predator, it would be unarmed, but an upgrade could fit it with anti-vehicle rockets. It could also be stealthy, possibly pending an upgrade.