The Naval Aircrewman rating (known as Aviation Warfare Systems Operator or AW prior to 2008) is an enlisted rating of the US Navy. It was previously designated as aviation anti-submarine warfare operator. However, under the CNO-directed "Helicopter Master Plan", all 78XX and 94XX aircrewmen were re-designated as "aviation warfare systems operators". The description of the Naval Aircrew Rate (AW) on this page define only the "Active Duty" aspects of the AW rate, fleets (aircraft), positions, and duties that are manned by aircrew in today's Navy. The Full Time Support (FTS) and Selected Reserves (SELRES) components of the U.S. Naval Reserves make up the largest number of Aircrew in today's Navy. Many technologically advanced navies have a similar trade.