Geschwaderkommodore (English Wing Commodore) is a Luftwaffe position (not rank), originating during World War II, that is the equivalent of a RAF Group Commander or USAF Wing Commander. A Geschwaderkommodore is usually of Oberstleutnant (Lieutenant Colonel) or Oberst (Colonel) rank. A Geschwaderkommodore will command a Geschwader (Wing), which in turn contains a number of Gruppen (Groups) commanded by a Gruppenkommandeur (Group Commander).
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The original article can be found at Geschwaderkommodore and the edit history here.