here is some info from wikipedia
Classes
Global Defense Force
* Soldier — carries heavy weapons.
* Medic — heals and revives comrades.
* Field Ops — drops ammo, calls in artillery and other field support.
* Engineer — drops landmines, repairs and destroys constructions and vehicles.
* Ranger — carries a sniper rifle, can hack strogg constructions using his PDA.
Strogg
* Tank (name might change) — carries heavy weapons.
* Meditek — supplies his teammates with stroyent, gained from corpses, that serves as health and ammunition for the stroggs.
* Oppresor — calls in field support.
* Constructor — repairs vehicles using an automatic drone, constructs and destroys constructions.
* Infiltrator — carries a railgun for sniping, can stroggify a fallen GDF corpse and transfer his mind into it to use the corpse. This equals disguising from Wolfenstein: Enemy Territory.
Weapons
Global Defense Force
* N93 Machinegun or GPMG (Soldier) — can be mounted by a soldier and made usable for other classes.
* N72 LAW Rocket (Soldier)
* N5 Machine Pistol (Field Ops)
* N22 Shotgun (Engineer)
* Land Mines (Engineer)
* Proximity Mines (Engineer)
* N80 Assault Rifle – scope or grenade (Medic)
* N38 Sniper Rifle (Ranger)
* Smoke Grenades (Ranger)
Strogg
* Lightning Pistol (Opressor)
* Hyperblaster (Tank)
* Obliterator (Tank)
* Bosonic Orb (Tank)
* Railgun (Infiltrator)
* Biolectric Pinch Bomb (Infiltrator)
* Nailgun (Constructor)
* EMP Charge (Constructor)
Strogg weapons do not need to be reloaded, but they run hot while shooting.
Vehicles
Global Defense Force
* Husky Quad Bike — allows one soldier to travel around quickly.
* Badger Truck — carries a driver, a gunner, and a passenger.
* Trojan APC — can carry up to 5 soldiers, can supply nearby units with ammo, is amphibious.
* Titan Tank — a tank, carries a driver, a gunner, and a cannon operator.
* Anasi Gyrocopter — a helicopter without rotor, handles like a helicopter or like a jet, carries a pilot and a gunner.
Strogg
* Icarus Hover Pack — allows to fly for a short period of time.
* Hog Truck — can use a powerful ramming attack.
* Desecrator Hovertank — hovering tank capable of crossing every terrain, carries a driver, a gunner and a cannon operator.
* Goliath Heavy Walker — huge walking powerful turret, carries one driver and one cannon operator.
* Hornet Flyer — an aircraft using anti-gravity thrusters to carry one pilot and one gunner. More maneuverable than the Gyrocopter, but is a very easy target for heat-seeking missiles when flying high due to the high heat the anti-gravity generators produce.
Wheels, ammo packs, and other objects can be shot to disable a vehicle.
Every vehicle can be fully controlled by one player, but is more powerful when controlled by more players. For example, the tanks' and the walker's drivers can fire the main gun in a moderate angle around the direction that the tank is facing; but it can only fire in a full 360° when one cannon operator is onboard.
Whether or not one faction can control the enemy's vehicles has not yet been decided.
source-http://en.wikipedia.org/wiki/Enemy_Territory:_Quake_Wars