The only civilian traffic I'm willing to accept is if they're part of a convoy you're tasked to escort (if such missions would be implemented).
As for allied forces, that could be interesting.
In a big conflict like that cooperation between various allied countries might not go as smoothly as expected and you could from time to time stumble upon subs from other countries - sometimes on their own, sometimes as a "3rd party" during missions.
And here are also the possibilities of escort missions.
But I think we'll get NATO forces eventually... probably along with a Soviet campaign.
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