At the start, kill the first wave of Zaku 2 in front of you. Once you get the message about enemy reinforcements, go to the northern-most part of the level. Locate the mountain in the center of the area limit wall and stand on top of it. Wait for the carrier. When the message that states that it has arrived appears, make sure you are blocking. The carrier will fire at you. Just as it crosses the area limit, jump up and land on the carrier. Take out your Beam Sword and hack away at the cockpit area. For some Suits, it ends here. For others, you have to kill the last Mobile Suits.