From Command and Conquer Wiki
The Battle Base is a unique GDI power projection system, deployed from the Rig. The Battle Base is essentially a tower with two pads outfitted with Guardian cannons and a SAM turret mounted on its top. Its main feature is three automated repair drones that repair all vehicles in proximity of the Battle Base using advanced nano technology. This greatly enhances the survivability of GDI vehicles in the field.
The Battle Base has heavy armor plating, but unlike the Outpost, it cannot expand GDI ground control, and thus structures can not be built around it. Instead, the Battlebase is regarded as more of a support structure, like a Watchtower or Guardian cannon.
The Battlebase lacks any dedicated anti-infantry weapons, and can be quickly dispatched by dedicated anti-armor troops, such as missile squads, Shock Troopers, and Zone troopers, or by dedicated anti-structure units such as Commandos or Black Hand.
