Of the various M113 type personnel carriers developed, the M113A2 began production in June 1979. Based on combat experience in Vietnam, this version was made with improved transmission, operating equipment and cooling system as well as reinforced suspension. Detachable fuel tanks were moved to the rear and external sides of the vehicle, smoke dischargers were mounted on the front, and the trim vane was enlarged. M113A2 units were deployed to the Gulf War in 1991, and in the 2003 Iraq War. The most recent M113A2 active in Iraq was also equipped with Combat Identification Panels (CIP), the latest friend and foe recognition device to prevent friendly attack.