[Myxale]

Kaleun [Ka-leun - One of the three lowest Officer ranks! ] is the Marine-Slang of the long and stiff sounding Kapitän-Leutnant! (imagine the crew calling you the long form, every time they verbaly get an order. :88 !

You'll still be Kaleun, cuz the title has the Leutnant-Rank in it - and indicates that you are also a Kapitän aka the commanding Officer of a Boot.

You're the Kapitän of your Boot, no matter if you command is given to you at the rank of Leutnant zu See or Oberleutnatnt zu See.