Automatically calls in 3 more Comanches when they're most needed.
~ Upgrade Description for the Comanche Defense in BTD6
Comanche Defense is the third path fourth-tier upgrade of the Heli Pilot in Bloons Tower Defense 6. Around every 25 seconds, whenever the RBE on the map is greater than 2000 RBE, the main Comanche Helicopter calls in 3 mini Comanche Helicopters armed with missiles and darts to aid it in battle. Eventually the Comanches will leave after 10 seconds. The mini-copters can spawn more than once a round if the round lasts longer then 25 seconds. It costs $8,500 on Easy, $10,000 on Medium, $10,800 on Hard, and $12,000 on Impoppable.
It is recommended to get other towers to support the Comanches because they appear every 30 to 45 seconds. An alchemist (3-0-2, 4-0-2, 5-0-2) is recommended, and a village is also. Note that the darts cannot damage DDTs or leads without a 0-3-0 village, Acidic mixture dip or Gwendolin's Heat it up passive ability. Also note that exiting the game and restarting the round will reset the cooldown on the passive ability, and so therefore could give the player a light advantage.