ever see a soldier using his RPG to blow up tanks? Well its because the RPG missile is using a special rocket called armor piercing warheads.
tanks have an outer armor called active armor, this armor defends explosions that hits the tank, the warhead design is to blow up the active armor and penetrate the actual armor with a second warhead, means this rocket contains two stacked warheads, one blow up the first and the second one continue its path to hit a second layer.
can be applied as secondary fire option for the RPG since it dont have any secondary attacks.
advantages: can shot through a thin layer of objects(crazytank armors, boxes, small houses, corners, you name it) and the shot will explode and the second warhead continue its path until it hits another object, great for take out vehicles.
side effects: if the object is too thick the rocket will not have its second warhead deployed, cost 2 RPG rockets for one armor pierce shots.