1) Naval rank of Germany 
Bootsmann (Btsm or B) is the lowest Portepeeunteroffizier (NCO without portepeé) rank in the German Navy. It is grouped as OR6 in NATO, equivalent to Petty Officer First Class in the US Navy, and to Sergeant in the British Royal Navy. In navy context NCOs of this rank were formally addressed as Herr Bootsmann also informally / short Bootsmann. Th...