The Commander reference article from the English Wikipedia on 24-Apr-2004
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Commander

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Commander is a military rank used in many navies but not generally in armies or air forces. It is below Captain and above Lieutenant-Commander. Formerly the rank was Master and Commander, and Commanders traditionally are known as Captain by courtesy.

A Commander in the U.S. Navy commands a Frigate, Destroyer, Submarine or shore installation, or is second in command to a Captain.

Sometimes the term kommandant is used.

In Fiction

See also