RSRDC stands for Run Silent, Run Deep Campaign. The stock game has way too many Japanese ships in way too many places. RSRDC uses historical records to make the ships be in places they really were. This means that you'll have a harder time finding them, but it also means you won't sink ten times as many ships as the real captains did.
It makes it harder to get high tonnage scores, but it makes it more realistic. You don't have to use it if that's not what you want right now. TMO and other supermods work fine without it.
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“Never do anything you can't take back.”
—Rocky Russo
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