class: ATGM description: The M551 Sheridan AR/AAV (Armored Reconnaissance/Airborne Assault Vehicle) is a light tank developed by the United States and named after General Philip Sheridan, of American Civil War fame. It was designed to be landed by parachute and to swim across rivers. It is armed with the technically advanced M81/M81 Modified/M81E1 152 mm gun/launcher, which fires both conventional ammunition and the MGM-51 Shillelagh guided anti-tank missile. introduced: 1966 manufacturer: General Motors, Cadillac Motor Company origin: USA price: 16 role: Light Tank variants: M551 "Sheridan": {}