There are currently 39 active duty four-star officers in the uniformed services of the United States: 13 in the Army, 3 in the Marine Corps, 10 in the Navy, 12 in the Air Force, 1 in the Coast Guard, and none in the Public Health Service Commissioned Corps. Of the seven federal uniformed services, the National Oceanic and Atmospheric Administration Commissioned Officer Corps is the only service that does not have an established four-star position. Modern day four-star officers' ranks are usually referred to as full general or full admiral, the officers themselves being referred to and addressed as 'General' or 'Admiral'. Four-star officers are ranked in seniority by their time-in-grade and/or by statute via the position of office they hold.