MIM-72 Chaparral. This self propelled AA vehicle is based on the versatile M113 APC chassis and uses the M-10 sidewinder missile stystem. Designed for long range AA, it was paired with the M163 Vulcan air defense system, also mounted on an M113 chassis, which would engage aircraft closer in. Both have now been replaced in US service by the Avenger air defense system, mounted on a modified Humvee. The Chaparral is still in use with several nations.