The High Mobility Multipurpose Wheeled Vehicle (HMMWV), commonly known as the Humvee, is a four wheel drive military automobile produced by the American company AM General since 1984.
It was the U.S. armed forces replacement for the Jeep.
Note that Hummer is the civilian version of the Humvee and has progressively become less and less similar to the military variant.
This tag implicates motor_vehicle (learn more).