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

Helping orphans the way you would do it
Insignia of a United States Air Force Lieutenant Colonel
the US Army, Air Force and Marine Corps, a lieutenant colonel is an officer superior to a major and inferior to a colonel. The rank of lieutenant colonel is comparable to the rank of commander in the US Navy. The insignia for all four positions is a silver oak leaf.

In the British Army and Royal Marines, a lieutenant colonel wears a crown above a pip. The crown has varied in the past with different monarchs; the current one being the Crown of St Edward

See also