A Bosn, BOATSWAIN, and BOSUN are all warrant officers in the military who serve on warships. A Bosn is a warrant officer responsible for the maintenance of the ship's hull, rigging, and equipment. A BOATSWAIN is a warrant officer responsible for the navigation, mooring, and anchoring of the ship. Lastly, a BOSUN is a warrant officer responsible for the discipline and morale of the crew. All three warrant officers are essential to the operation of a warship.