Question about modding campaign.
I have 3-4 careers of different types, 1 is for a realistic one, one is for just trolling and shooting, and I want to create one that mimics a nuclear sub career. I intend to use a XXI boat with unlimited diesel, air, and batteries to simulate a reactor but I don't want to start at the tail end of the war. How do I make the XXI available in 1939?
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