 In 1948 the US Army purchased a small number of these test vehicles with the designation the Jungle Burden Carrier for evaluation in jungle warfare and with airborne forces.There were 11,240 Mules produced between their introduction and 1970, when production ceased.They were used throughout as platforms for various weapons systems and for carrying men, supplies, and weaponry/ammunition during the Vietnam War and in other U.S. military operations until the 1980s.