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

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In the US Navy, a lieutenant commander is an officer superior to a lieutenant and inferior to a commander. The corresponding rank in the US Army, US Air Force and US Marine Corps is major.

A Lieutenant Commander is a senior Department officer on a large ship or shore installation. He or she may be executive officer (second in command) of a smaller ship or instalation

See also

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