“Helicopters can have several different types of rotor configurations. These include tandem, coaxial, transverse, or intermeshing.”
|Chapter||Requirements||Cost Food||Time||XP Gain||Descripition|
|1||Library level 11 + Elite Paratroopers||2,100,000||16h||1,475||+10% Attack Helicopters hitpoints|
|2||4,200,000||4d||3,950||+10% Attack Helicopters damage|
|3||6,300,000||7d||5,370||+10% Attack Helicopters hitpoints|
|4||8,400,000||9d||6,165||+10% Attack Helicopters damage|
|5||10,500,000||13d||7,550||8x Attack Helicopters damage against defensive buildings|
Community content is available under CC-BY-SA unless otherwise noted.