1WO means...

[frau kaleun]

Originally Posted by HW3

Here is a link to a chart showing the Kreigsmarine rank and its equivalent rank in the U.S. Navy.

http://www.feldgrau.com/kmsranks.html

You will note there are no Warrant Officers in the U.S. Navy either. The 1WO would usually be a Oberfähnrich zur See or a Leutnant zur See.

I'd think those ranks would more likely be seen at the Second Watch Officer position, with an Oberleutnant at 1WO, unless of course the kommandant was still an Oberleutnant. May have been much more common though as the war went on and training time was cut short and the number of available officers overall declined.