I found this crazy and so-stupid-and-full-of-cliches-that-it's-really-fun-to-read manga while reading about manga's being recommended.
Combination being used is:
Naval Warfate+WWII+Yuri+All female crew+captain is an old guy

It's about a japanese commerce raider in WWII with an all female crew ( except for the captain ), a german submarine captain and her crew ( female ), a british warship ( female captain ) and various other people.

Believe it or not, despite all the cliches and yuri and so on, it's hilarious. I'v been laughing my @ss of here.