@ Torplexed... I see your point, and it makes good sense, however I don't think anyone's getting anything close to historic in any campaign even on hard mode. (concerning tonnage that is)
I would simply enjoy the unique play of a Japanese sub. I wouldn't really care about the authenticity of historical sub usage by the Japanese... I'd tend to see it as a "what-if" campaign. I'd even love to play as Russian and British forces!
@ WEBSTER.... suh-weeeet!