Prefab Fortifications 1: Perimeter and Defense.

when seeking to establish a sense of permanence on a captured world, Sparta can deploy a set of general-purpose pre-developed equipment, intended to make construction of bases and facilities swift and efficient.

the most important elements of a military facility are a means of keeping out intruders. this is accomplished by an established perimeter, limiting access to only those who are invited in.

the Walls that are placed can withstand bombardment from tanks, artillery and heavy energy weapons should the base overshield generator be compromised. each wall segment joiner can mount either a manned watchtower, or one of three weapons emplacements that mount either a rotary barrel Machine gun/energy weapon, 40mm Grenade launcher, or light anti-armor/aircraft missiles. these weapons can target forces on the ground as well as aircraft or enemies equipped with jump-jets or other such means of personal flight.
energy gates able to slice through all but the most dense of materials are backed up by solid blast gates that shrug off high explosives and penetrating charges with ease. These walls are usually erected in rows 3 or four walls deep for extra protection.

Within the base area itself, defensive weapons in the form of pillboxes mounting machine guns, open pits which can house anything from a fire team to a Mortar position, or Artillery pieces such as Howitzers or MAC guns, form a cross-fire pattern that gives invaders no place to hide. Minefields and Energy disruptor fields which scramble electronics and dissolve any organic matter that enter them also assist.

another weapons system that can be typically found are ICBM emplacements, usually dug into the ground but occasionally on the surface, these weapons are designed for long-range counterattack, and certain versions of the weapons can even reach orbiting vessels.