Thanks for the replies. I'm trying to do a campaign where the captain is secondary and the crew (and U-Boat are what counts). Captains came and went after at most 16 missions. But the U-Boat and crew (barring transfers, deaths, etc) remained in the fight. It's my way of starting in 1939 and working my way through the war until it's end. I was just curious because I didn't want to go through the entire war in a IIA so when the time comes for the captain to get a new boat I'll probably relieve most of the crew replacing them with green sailors, change the names of others to simulate some experienced crew on the new boat and take a few of the crew (and maybe an officer or two with me) to the new U-Boat.
It's a little over the top I guess. Oh well. It's all about having fun right?