Grunt is the base unit, and the cheapest. I prefer to use it as the bulk of my army and as a last resort.

Assault is your base rapid unit, just being rapid grunts that cost more and are more useful in strategies.

Grenade Launcher is your base AOE unit, and is good with dealing with buildings, walls, and grunts.

Medic is your unit support troop, and I never really use them, though they do increase units health.

Engineer is your structure support unit, and nothing else. They have a shotgun but is it weak and they are not very good.

Flamer is your decent AOE unit and is decent on dealing with large groups of weak units, as well as low level buildings.

Ranger is your decent rapid unit, being like a taller, tougher, and stronger Assault, and is expensive to recruit, but is worth it.

Sniper is a slow-shot unit like grunts, and just like the sniper towers, one-shoting all of the enemy units one-by-one.

Machine Gunner is a expensive rapid fire unit that will tear through other players units with extreme fire rates.

Rocketeers are bulky AOE inits that will rage through the enemy walls and structures, blowing every single soul all the way to Jupiter.

Riot is a nightmare AOE unit, wrecking havoc among the enemy's structures and units. It has slow-reload stun grenade launchers, thus causing the enemy lots of problems due to stunned buildings and units.

Mercenary is just a downgraded Ranger, it is a decent suppressor, but ultimately is trash.

Chemist is a poison gas Flamer, it is against the Geneva Convention, and it is POOP.

Sharpshooter is not as trash as Chemist or Mercenary, but the normal Sniper is better.

Sergeant is ok, with a unit support ability. It also has a dodge that only works like 10% of the time.

Colonel is pretty much the same as Sergeant, but makes troops attack harder instead.

Bombardier is a CHAD Grenade Launcher, shooting a barrage of missiles instead of one.

Surgeon is a ok unit, it can resurrect units but one its dead your done for.

Commando is stronger and cheaper Machine Gunner, and is a decent rapid fire unit.

I have not played this game for long, but it is a good game and i hope it does not get shut down just 2 months after i downloaded it. It has been a great game, and i hope BaronVonGames and the STEAM Community and the other supporting people can keep it back, or at least take 50 screenshots so we remember this once great game...