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. The rank evolved in the 18th and early 19th centuries and was originally known as Master and Commander. The Royal Navy shortened Master and Commander to Commander in 1814.
A commander in the Royal Navy and the United States Navy is equivalent in rank to a lieutenant-colonel in the army (Pay Grade of O-6). A commander may command a frigate, destroyer, submarine, aviation squadron or shore installation, or may serve on a staff. A commander who commands a unit may be referred to as "Captain" as a courtesy title. A unit commander may also be informally referred to as "skipper."
In the highest levels of U.S. military command structure, "commander" refers to what used to be called commander-in-chief, or CINC, until October 24, 2002 (CINC is still used in casual speech). This is usually referred to with the area of which the officer is commander. For instance, General Tommy Franks was CENTCOM commander until July 7, 2003.
More on [ Commander ]

AI Fleet Commander GPL - Source code and Win32 binary.
Meta Description: [ AI Fleet Commander homepage. AI Fleet Commander is a space combat game originally written by Devon Ellis. Plays write the AI for robot fleets which do battle. ]
Fleet Commander BETA Reference Guide - Downloadable guide by Devon Ellis.
FolK's Fleets - Many downloadable AI fleets programmed for AIFC.
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