Base Conquest
If the last combat unit defending a base (or non-combat if no combat units are present) is defeated, then all non-combat units are destroyed and, unless a Perimeter Defense is present, the population of a base is reduced by one.
When there are no defenders a base may be captured by opposing factions or attacked by native lifeforms. Land bases may be captured by land combat units, while sea bases may be captured by sea combat units or land combat units with the Amphibious Pods ability. Air combat units which do not refuel (Gravships and Locusts of Chrion) may capture any undefended base, but those which do refuel (Needlejets and 'Copters) may not capture bases. A captured base passes into the control of the attacking faction. Conquering a base destroys a random number of the base's facilities (but never a secret project) and reduces the population of a base by one (if total population is one then the base is destroyed). The capturing unit is fully repaired (unless it is a Battle Ogre).
If a wild native lifeform enters an undefended base, it destroys one random facility, or devours one population then disappears.
