Frigate captain

Frigate captain is a naval rank in the naval forces of several countries. Corvette lies one level below Frigate.
It is, usually, equivalent to the Commonwealth/US Navy rank of commander.
Countries using this rank include Argentina, Colombia and Spain (), France (), Belgium (), Italy (), 
Brazil and Portugal () Croatia () and Germany () .
In the Royal Canadian Navy, "capitaine de frégate" is the official French language name for the rank of commander.
The NATO rank code is OF-4, the official translation for instance of the German "Fregattenkapitän" as well as the French "capitaine de frégate" into English is "commander senior grade".
The Russian/Soviet equivalent is "captain of the 2nd rank" ("капитан 2-го ранга")
Germany.
 "Fregattenkapitän" is a German Navy line officer rank OF-4 equivalent to Oberstleutnant (en: Lieutenant colonel) in German Army and German Air Force.