Some Missions May Not Be Available Until The Completion Of Others.
Units receive a 40% range boost and 20% damage boost against all targets when in bunker. See above table.
Prior to the 2/12/2014 patch, the bunker bonus was instead of the AA bonus. It is now in addition to it.
Units in a Bunker do not take up space in your Base Defender Platoon after the 9th of January "Calling In Reinforcements" update.
Upgrading a Bunker provides more space for additional Units to be added.
A Bunker must be at least Level 2 prior to making a change to to the Bunker's type.
The Standard Bunker is the most universal of the three in terms of bonuses vs both Air and Ground Units.
Snipers housed in a Bunker can provide good cover for Land Mines by preventing small Mine Sweeping Units or Attack Dogs from prematurely detonating them.
A Bunker stocked with Mortar Teams can do the work of Mortar Towers (Mortar Turret). Load Heavy Gunners into a Bunker to function like a Gun Turret (Machine Gun Turret).
Troops rely on a bunker when the going gets tough. Upgrading this defensive structure increases its capacity and defense.
— In-game description
The Standard Bunker is unchanged, it gives all units within a 40% increase in range and a 20% increase in damage to all attackers (infantry, vehicle and air)
— Kixeye description
Picking off enemy units while sipping tea.
— Level 6 Upgrades posted on Facebook
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Will bunkers be getting any sort of update?
We have some twists on the idea of turret platforms coming out in the next few months. Bunker updates are an idea we’ve kicked around for after that. What kind of update or improvements would you like to see? - AMA with WC Design Team ( Aug 26, 2014 )