This soldier class has moderate health and running speed. Assault uses assault rifles as his primary weapons which grants him the ability to perform well in any situations. If you need real action, choose assault to cover your enemies with a wall of bullets.
Assault is the only unit that can equip a universal weapon as his secondary weapon instead of pistols. Make sure to buy and use some more powerful grenades that exclusively belong to the assault unit - you can change them by pressing "4" in-game several times, remember?
The best thing about this unit's strategy in-game is that it can equip some very powerful explosives such as Demo-charge and Remote dynamite that exclusively belong to the Assault. Then he can just watch his enemies fall into his trap and detonate the explosives from a distance.
The Scout is a very fast unit but with low health. He equips sniper rifles as his primary weapons which grants him a deadly and accurate force to eliminate enemies from a long distance. If you chose playing with the scout unit you can support your team's strategy by providing cover fire for your friends and search for strategic positions to cover in. Have in mind that this class will be a problem on smaller maps where players prefer fast action games.
Scout can equip land-mines that exclusively belong to his class to ambush enemy soldiers and tanks. He can also equip radios to call in artillery fire or scout airplanes to the battle field. His sneaky style will sure prove useful to your teammates, right?
Support is the heaviest unit of all classes which makes him really slow but with high health. He can equip machine guns as his primary weapons which grants him the power to lay a thick bullet barrage to suppress his enemies.
This is the only unit that is able to equip flamethrowers and anti-tank rifles which have the strongest firepower on the battlefield. It surely isn't pleasant for your enemies to see this huge walking threat on their ground so try playing with this unit and scare everyone around you.
Don't forget that the most important team contribution of the Support unit is that he exclusively equips medic-kits and ammo-kits to provide timely support to his allies.
The engineer unit characterizes with relatively low health but high speed. He can equip submachine guns as his primary weapon which grant him awesome close distance combat skills.
Engineers can also equip rocket-launchers as their primary weapons - they are effective against both tanks and infantry units on the battlefield. Try playing with a rocket launcher - you will surely have fun to throw your enemies around like bowling pins.
The strategic advancement of this unit is to build stationary heavy machine guns to provide great suppressive fire and metal shields to provide good covers. Just take out your wrench and all the magic begins!
For more details, check out the official website.