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

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Insignia of an United States Air Force Lieutenant General
Lieutenant General is a military rank used in many countries.

A Lieutenant General ranks immediately below a General and above a Major General.

In the US Army, Marine Corps and Airforce a Lieutenant General is a three-star General. For insignia in the British Army see General.

A Lieutenant General is equivalent to a Vice Admiral in both the US Navy and Royal Navy. Its equivalent rank the the Royal Air Force and airforces of many Commonwealth countries is Air Marshal

See also: wiktionary definition of and Comparative military ranks.