...or just open the save game file and change the name of the sub there, unless seeing the name of the sub being presented to you is important, then go with what sniper said.
Documents > SH4 > Save Game > ActivePlayerUnits.upc (if it's not that one then it's CarrerTrack.upc)
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"Damn the torpedoes, full speed ahead!" -David Farragut (probably repeated by many WWII sub skippers)
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