IRL, they conducted schools on subs during patrols. Once the crewman could demonstrate certain knowledge and skills, he'd be promoted. Of course, the official paperwork would have to wait until the return to base.
I would assume (hope not to make an ass of myself), the promotion in game would raise the ratings of the individual crewman. Although, I have not checked it out. I'm not sure how to tell who will promote. Just seemed too tedious to record the dozens of crewman's skill set levels.
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