Pipe bombs Hand grenades and mirv grenades. No battle would be complete without a medic on either team. Medics are very annoying if you're against them but extremely helpful if you're with them. They can infect you and your health will gradually go down to zero. You pass the infection to team mates on contact and the only way of stopping the infection is for a medic to cure you.
Medics can also provide instant recovery as far as health is concerned.
Auto Nailgun Hand grenades and halucinative bombs. This fella is very slow but has more weaponary and armour than all the other classes. He primarily carries a huge machine gun that penetrates armour and flesh instantly. And due to his high armour is difficult to kill. His speed lets him down.