Like Fighter Aircraft and Bomber Aircraft, Helicopters are built at the Airbase, with production requiring both Wealth and Oil. Unlike other Aircraft, however, they are not garrisoned at the Airbase; they do not need to return to the Airbase to refuel.
Helicopters are effective in taking out Artillery Weapons, Tanks and Submarines as well as special units like Supply Wagons and Generals. They receive a massive damage bonus against Tanks in particular. They also act as detectors, revealing hidden enemy units.
Helicopters can be countered with mobile Anti-Aircraft and Air Defense Structures, modern Light Ships and even modern Infantry. They can be directly attacked by many ground units, even Slingers, as well as by buildings; although a Fort for example cannot otherwise hit air units, it can attack Helicopters.
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