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You can buy weapons by prrssing gear key when landed, it's mentioned in training.

Only the rockets\missiles\bombs are finite and purchaseable, bullets like the turret and gunpod are infinite so you won't be completely defenceless. Campaign mode is similar to the one from gunship 2000. You complete missions to make the campaign status superior to your ally. If the ally's status reaches nearly 100 enemy will surrender and the campaign ends as your victory.