Generally, DW is like the original OM in this regard. You upgraded from a IIB to a C model because the B was "retired". Likewise, if you are at a location where a D will be available at the time the C is retired, you might step into the D. If the D isn't available, then the next higher boat, such as a VIIC, or whatever might be available. If no boat is available, then you are retired. Exceptions are when the "modern" submarines get close to being available. OM and DW are both set-up with only the XVIII, XX! and XXIII being "true" upgrades. Most conning tower upgrades do not fully function either. Of course, SH4 never did institute those correctly for the German side...
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"...and bollocks to the naysayer/s" - Jimbuna
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