Patrol

Patrol is a final tower on the list but might not be it if admin towers come.

Cost: 600

Upgrades
Spiked Bumper: Costs 400, gives you a spike bumper and gets more damage.

Suicide Mission: Costs 700, gets an C4 and it gets damage.

Mounted Gunner: Costs 1500 and gives you a gun that rotates well.

Tank: Costs 9000, became a tank, More HP and More damage, and the gun is now explosive.