It has largely supplanted the roles previously served by the 2.5-ton M151 also those of the M561, its ambulance versions M718A1 and M792, the CUCV, and other light military vehicles of the United States. The HMMWV (High Mobility Multipurpose Wheeled Vehicle) or Humvee is a 4×4 multipurpose military vehicle developed in the 1980s by the United States.