|Killzone 2, Killzone 3, Killzone: Mercenary|
Heavies possess a lust for battle that surpasses most Helghast troops; they are often seen taunting and threatening their foes in the thick of battle, while slowly advancing upon them and disregarding incoming fire. Heavily armored and well-equipped, they hail bullets on enemies that get caught out of cover and can flush out anyone hiding in cover by lobbing grenades.
Heavy Trooper's weak spots are the red tanks on their backs, but in order to be able to hit them, you have to make him turn around by shooting them in the helmet or by throwing grenades at them. Conversely, they can also be taken down with a few direct hits from a rocket launcher (i.e. the VC9, since the M80 is not available in the Campaign). Once the tanks are destroyed, the Heavy explodes in a massive fireball that severely damages or destroys anything nearby.
This can be used to your advantage to clear the area of weaker soldiers. It is also suggested you take cover while trying to eliminate this opponent, for this soldier wields a weapon that is able to quickly eliminate entire squads of soldiers.