At the crew management screen, it says in the top left "USS GATO" - that's not just a class, but a historical sub itself.
Now the question: Does this mean that we get actual subs with the correct historical names? Very cool feature if so.
And if that is true, then, if radio messages do mention real subs, will having 'that' sub prevent historical messages regarding that sub? I.e. if USS Sea-Weed (puff puff) went down historically at a certain time or performed some feat, but you are commanding it, you won't get a radio message detailing the feat you obviously didn't commit.
In the add-on radio messages for SH3, you could get U-48 or whatever, and then get messages from/to U-48 but it obviously not being YOUR U-48.