This can be a really difficult mission. First I recommend a tesla coil and flak cannon protecting the area around the radar - the Americans will send rocketeers and transports loaded with tanks and other nasties to attack your base. And they begin doing this soon after the start so build your defenses as top priority. Build a navy after you're capable of defending your ground, as you must do some clearing of american troops from the beach to the northeast. Dominate the water then the land so to speak. Dreadnoughts are key here, but you will want many submarines to protect them. If at any point you run out of funding there is an island to the east which has a tech outpost on which you can construct a new ore refinery. Clear the beach with your dreadnoughts (watch for enemy SEALs! keep some scorpions around to take them out, I found them pretty effective) and land your forces here. Bring some V3s along to attack the prism towers that are guarding the battle lab. These things are especially dangerous because of their numbers. They have enough power to destroy an apocalypse tank. Otherwise this is a by the book base assault, but don't capture the battle lab until you're prepared to deal with an entirely new base and a weather control device countdown. Before capturing the battle lab construct a nuclear missile silo and make sure your countdown is less than five minutes - you want to shoot first in this superweapon duel. Capture the battle lab and unleash your nuclear strike on the weather control device - center the attack on the device itself, not nearby as you wouldn't want to leave it standing. With the controller destroyed, you are victorious.