[noncommissioned officer: an enlisted person of any of various grades in the armed forces, as, in the U.S. Army, from corporal to sergeant major inclusive: see also petty officer." Commissioned officer: "an officer in the armed forces holding rank by a commission" -- lowest, second lieutenant or ensign in Navy and Coast Guard]
[[=boatswain, from OE swegen, "servant"; "a ship's warrant officer or petty officer in charge of the deck crew, the rigging, anchors, boats, etc."]