Command Centers are a base facility in Alpha Centauri and its expansion. They are available upon the discovery of Doctrine: Mobility. Land units created at a base that has a Command Center start off with +2 to morale. Damaged land units in a base that has a command center can be fully healed in a single turn, unless the base in question is under artillery bombardment.
A faction that controls the Command Nexus will have a Command Center at every base, maintenance-free.