deploy more powerful units, construct advanced structures, as well as requesting Max Clearance.
Note that the clearance signal can only be broadcast in a small radius around the Construction Yard or the Command Hub. Any structures outside of the broadcast radius cannot produce tier 2 units until a Construction Yard/Command Hub near them purchases the clearance upgrade.
|Barracks||Armor Facility||Airfield||Naval Yard|
|Spy||Guardian Tank||Cryocopter||Assault Destroyer|
|Cryo Legionnaire*||Pacifier FAV*|
|*= Requires Defense Bureau|