: Focus on Machine Gun turrets. Get them to level 3 quickly to handle light units.
: Combining the Dig perk with Flame specializations (like flaming rockets or incendiary cannons) results in high-damage zones that also slow down enemy units. Recommended Turret Progression iBomber Defense
For detailed level-by-level breakdowns, the iBomber Defense Strategy Guide on provides specific turret placement diagrams for both Allied and Axis campaigns. iBomber Defense Strategy Guide (SOE) - Steam Community : Focus on Machine Gun turrets
: Introduce Cannons and upgrade Comms turrets to level 2. For "imba" (imbalanced/strong) setups, use a mix of Maxed/Digged Machine Guns and Flame towers for crowd control. iBomber Defense