I will be terraforming one of the other moons of the same gas giant... Dagmar, the fourteenth moon. It will become the civilian colony in the system, while Brigit remain a naval base. The "colonists" on-board the orbital habitat are workers, who will be used to assemble PDCs on the uninhabited eighteenth moon that Brigit orbits.
Hmm, is it possible to build armed space stations? PDCs probably make more sense, but it seems a bit strange in principle, using them to guard an orbital base.