The chairman of the Joint Chiefs of Staff (CJCS) is assisted by the director of the Joint Staff (DJS), a three-star officer who assists the chairman with the management of the Joint Staff, an organization composed of approximately equal numbers of officers contributed by the Army, the Navy and Marine Corps, the Air Force, and the Coast Guard, who have been assigned to assist the chairman in providing to the secretary of defense unified strategic direction, operation, and integration of the combatant land, naval, space, and air forces.