The High Mobility Multipurpose Wheeled Vehicle (HMMWV), commonly known as the Humvee, is a four-wheel drive military light truck produced by AM General. It has largely supplanted the roles previously performed by the original jeep, and others such as the Vietnam-era M151 jeep, the M561 "Gama Goat", their M718A1 and M792 ambulance versions, the Commercial Utility Cargo Vehicle (CUCV), and other light trucks. Primarily used by the United States military, it is also used by numerous other countries and organizations and even in civilian adaptations. The Humvee's widespread use in the Gulf War of 1991, where it negotiated the treacherous desert terrain, helped inspire civilian Hummer versions.