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The second-in-command is the deputy commander of any British Army or Royal Marines unit, from battalion or regiment downwards. He or she is thus the equivalent of an executive officer in the United States Army. This terminology is also used in many other Commonwealth armies. The second-in-command of a battalion is usually a major and the second-in-command of a regiment is a lieutenant colonel. The second-in-command of a company, squadron or artillery battery is usually a captain, the second-in-command of a platoon or troop is the platoon or troop sergeant, and the second-in-command of a section is usually a lance corporal. In the Royal Navy, the second-in-command of a vessel is known as the first lieutenant or executive officer. (via Freebase)