Summary: all equipment, resources,
and most marine activities, depend upon structures,
selected and placed by the commander. Placed
structures must be built by marines.
Function: not a new structure, but instead
a research upgrade to the Turret
Factory.
:
extremely powerful offensive
artillery, siege turrets are a common tactical
response to alien hives
and chambers.
See the siege turret
entry in the weaponry
section for more information.
New Equipment: commander can purchase
siege turrets.
To get an overall picture, see the 
New Equipment: commander can purchase
Cost:
Build time
Armor Pts. 