Enemy units are bombarding area which is under our control, but soon, we will have nothing to defend, because everything will be leveled to the ground. We have one minute left. Get behind the flak cannon, and shoot down all planes and nuclear bombs. This anti-air turret is our only chance. Do not let anything land, and we should be fine. Complete missions, and buy upgrades for your cannon, so you can withstand more incoming enemies. Have fun.