Bah! We ARE talking about the US military, aren't we? Wasn't that guy who received your promotion the Admiral's daughter's shackup? Wasn't that sugar boat HIS deathtrap until now? See how it all makes sense? Why things are working normally after all!
Now my advice, sailor, is to take that piece of horse squeeze out of port with a smile on your face. It has those slow but reliable Mark 10s on board, which actually go boom when they hit the target. You have a submarine that is optimized for underwater speed, not surface speed and can do 10 knots submerged, faster than his fancy dancy fleet boat. Your new ride is the pattern for that new-fangled Type XXI the Germans will build in a couple of years. It's not so bad.
Now go kill several Japanese freighters and tankers. The loser whose main qualification is he's poking the Admiral's daughter never sank anything with your boat. Show the admiral that he might make a better decision next time. Failing that, show everyone that the admiral is the one with a problem, not you.
Who shives a git what boat you got? This fleet boat captain would sail in a wolfpack with you any day. Sink 'em all!
