The U.S. Army’s active rotorcraft, the AH-6/MH-6 “Little Bird” helicopter, is currently in service with the Army’s 160th Special Operations Aviation Regiment (Airborne Regiment). After the Vietnam War, the Army's OH-6 light observation and command helicopter fleet was reassigned to the National Guard. However, due to their excellent somersault maneuverability and extremely high power-to-weight ratio, they were subsequently selected for special operations use in the 1980s. In addition to the various famous helicopters mentioned above, the Army also uses many fixed-wing aircraft, including the active short-range multi-purpose C-12 King Air designed to fill air transportation needs beyond 800 nautical miles. ". This non-commercially developed aircraft platform provides commanders and staff with efficient, round-the-clock transportation of low-volume, high-value parts and equipment. Air Traffic Control Systems and Tactical Systems Army Air Effectiveness Services provide safety and survivability to Army flying assets on the modern battlefield. Tactical air traffic control supports the commander's automated airspace command and control needs of air and Army components as well as back-end and terminal tactical traffic control for aircraft operations. Army unmanned aerial vehicle systems support land combat operations within the conflict spectrum. Infantry, reconnaissance, intelligence, aviation, artillery, maneuver units and even medical units will all benefit. Its typical missions include intelligence, reconnaissance and surveillance, battlefield damage assessment, target location, persistent surveillance for follow-up operations, escort protection and counter-ambush