Tank Trap Barricade
|Free||None||0||Garrisonable base defense.
|$1200||None||-4||Anti-air base defense.
|$600||Solar Reactor||-2||Anti-infantry base defense.
|$400||Solar Reactor||0||Garrisonable base defense.|
|$1000||Solar Reactor||-3||Anti-vehicle base defense.
|$1000||Research Facility||-1||Long-range base defense.
|-5||Long-range base defense.
Only four Grand Mortars may be built at a time.
Fire Control Station
|$1000||Research Facility||-3||Artillery support defense.
Only four Fire Control Stations may be built at a time.
andFire Control Station
|-4||Long-range bombardment defense.
Only four Munitions Bunkers may be built at a time.