It turns out that you've discovered that base that you stumbled upon contains hundreds of nuclear warheads. Enough to destroy North America. The rebellion is now constructing an EMP shock wave that you can use to shut down the nuclear warheads. You must find a way to infiltrate their base so you can plant the EMP. The shield to the base is powered by a generator on a distant moon. You send a troop to destroy the generator. If your squad is defeated, all is lost.