|- | class="eva_box_title" | Role | class="eva_box_data" | Control turret |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |} Following the Second Tiberium War, Nod scientists began looking at the problem of static base defense in a new way. To maximize effectiveness and survivability, the new generation of weaponry consists of four components; a central hub and three turrets. Some Nod commanders also have access to the quad turrets upgrade; which allows a fourth gun to be mounted upon the hub. Hub Defense Systems do not appear in the Fourth Tiberium War.