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In the Royal Navy and US Navy, a Lieutenant Commander (Lieutenant-Commander or Lt Cdr in the RN) is a commissioned officer superior to a lieutenant and inferior to a commander. The corresponding rank in the British Army, Royal Marines, US Army, US Air Force and US Marine Corps is major, and in the Royal Air Force is squadron leader.
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 installation.