Max Clearence is an upgrade available only to Allied Construction Yards and Command posts.

Once researched, it opens the 3rd and final tier of the Allied Arsenal. However, a Defense Bureau is

War Factory with Max Clearance - Notice the pale blue lights on the side and the top of the facility.

required to unlock some units.

Note that the upgrade has only a local effect, meaning that if the Construction Yard has researched Max Clearence then it will only affect production buildings in its vincinity only.

However, you can research the clearence via command posts themselves if you want to grant your production buildings with improved clearence at the cost of researching the same upgrade individually.

Units/Structures Unlocked
Barracks War Factory Airfield Docks Construction Yard
Tanya Mirage Tank Century Bomber Aircraft Carrier Proton Collider
FutureTank X-1

Harbinger Gunship

Athena Cannon

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