Nothing happends if you dont manage to get all stars.
I had just 3 of them cuz i didnt bugger my self to do thos goals.
When the campaign was over (reached the timelimit) The breifing just said it will be tougher for germany in the coming war. Alltough i dont think it affect the game play at all but is just a text rubbish part in that debriefing.
And next that happend was Happy days campaign started whit new goals etc. And i culdnt se any difference, eg harder AI etc. same stupid boats as normal for this game.
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