Great, a naval mission. I do dislike these, but it's more interesting to me when controlling the Soviets. You're faced with another countdown here, so get to work! Establish a fleet of submarines like the last naval mission. You never know when Allied destroyers etc. could attack your base and the 'Korean fleet' is a large group of these including some aircraft carriers. Build some flak cannons around your base to help protect it from the hornets. There is somewhat of a choke point northwest of your base, defend it well. And keep those subs stationed around your coast to protect/warn against transports. Fortunately, tesla coils are available for the first time. I highly recommend boosting them with two tesla troopers each. It extends their range and improves the firepower significantly. When the Korean fleet does arrive try to protect your Dreadnoughts as they make the last part of this mission very easy. After eliminating the Korean fleet, go out and scout the map with some sea scorpions. They are fast and have a nice sight range. Eliminate all the naval forces that aren't a part of the main base and station some submarines outside the harbor so you know where all the enemy ships are. Use your Dreadnoughts (I hope you managed to save them) to pick off the Prism towers guarding the harbor one by one. If there is a patriot missile battery shooting down your missiles and I'm sure there will be, destroy it first. You don't even have to destroy the ground forces here - note the objective is to destroy the navy. Finish off every ship here and you're victorious.