Turrets

Turrets are a defense-only unit — the defensive counterpart to jets. They have a defense of 2 and an offense of 0, which is about twice as strong on defense as a trooper.

Turrets shoot down attacking jets, destroy attacking tanks, and kill attacking troops. They also help stop incoming nuclear missiles.

Covert operations cannot destroy your turrets, so they form a stable core for your defense.

Some strategy guides call this unit a "Missile Base." It is the same defensive unit.

Build turrets to defend your regions, and pair them with troopers and tanks so you can both defend and attack.