Yes you are right. But it were the best medium displacement boats of the Imperial Japanese Navy and they had very rich military life. I think it would be very interestingly for the campaign.
PS. Kaichu 5 (RO-33, RO-34) had 8000 miles at 12 knots and Kaichu 6 (RO-35 and following) had 5000 miles at 16 knots
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