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Door Gunner is an upgrade in the Military Monkey Knowledge Tree that was introduced in Version 17.0. It allows the Special Poperations to add another ability that allows it to pick up any tower below Tier 5 for as long as the player wishes until dropped onto a new location. Door Gunner requires Charged Chinooks before unlocking this upgrade. It requires 14 points purchased into the skill tree before speccing into, along with 1000 as a one-off purchase.
The Door Gunner ability unlocks for the Special Poperations when the "Door Gunner" MK is unlocked and active. The main function of the Door Gunner ability is to pick up any pickable tower Tier 4 or below (this excludes Heroes too) and allow the tower to attack while active. The tower will not be able to change target priority or activate their abilities until transported to a new location, although the picked up tower's ability can still be active while transported via Door Gunner.
When activated, the ability sends the helicopter towards the selected tower and picks it up. Once activated, the tower will continue shooting on their set target priority until transported back to a new location via pressing the Door Gunner ability again.
While a Door Gunner is active, the Redeploy ability is disabled until the Door Gunner is placed onto a new location. When the Door Gunner is relocated onto another location, the 60-second cooldown for both Door Gunner ability and Redeploy ability will begin. Note that both the Door Gunner ability and Redeploy ability are shared between each other; activating either ability sets the cooldown for both abilities.
Certain interactions occur while using Door Gunner. For example, Engineers with any Path 1 upgrade (except with Tier 5 upgrades) will drop their sentries directly below where the Special Poperations Heli is currently hovering at, or to the nearest placeable land spot if the target location is water or otherwise considered unplaceable terrain. Additionally, it is possible for the Door Gunner's ability to be active while picked up, but the Door Gunner's abilities cannot begin while picked up until placed down.
- On Version 17.1, there was a bug where a Door Gunner could be used to transport any tower, including Sun Temples and True Sun Gods. To pull it off, get a Destroyer, activate Door Gunner on it, get another Chinook to quickly pick up the Destroyer mid-way through, and then quickly upgrade to Aircraft Carrier after the Door Gunner picks it up while the original Support Chinook ability menu is still on. Then upgrade the Aircraft Carrier to Carrier Flagship, and then place towers on top of the tower corresponding to the two land platforms.
- ISAB made a video showcasing that glitch on the video "Using Glitches To Make A Portable True Sun God! (Bloons TD 6)".
- This glitch is patched on Version 18.0.