From Command and Conquer Wiki
The Armoury is a two-story modular GDI building housing storage for advanced equipment and weapons, such as composite armour suits, scanner packs and power packs, high power radio equipment and large caliber sniper rifles. It also houses the equipment required to train commandoes and snipers. The Armoury also contains an infirmary capable of healing units to full strength, replacing lost soldiers with fresh reinforcements with the same level of veterancy, and are rumoured to even have the ability to heal Tiberium related injuries. The GDI Steel Talons subfaction has no need for an Armoury, as they primarily rely on tanks and other vehicles.
