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This is a much harder defensive mission, now you have several good bunkers, but they get overrun by a swarm of US Marines and amphibious armors, your only best defense is the center, you'll have no choice, but to let your troops defend on the open and use reinforcement trucks, only then the assault will stop, then their another attack will be on the left, the Australian troops with a courier will be there.
The last is to take back your areas they occupy, however you'll take do the hard way, which is banzai your way on them, cause the Americans have heavy artillery and battleship, meaning counter-attack with huge losses.