Hummer's are like 'Humvee light'... based on the military version, but very much civilian. The later variants of Hummer are actually smaller than the military version. Presumably the civilian versions are also less armored and perhaps even have a weaker chassis :)<br/><br/>Just to add to the confusion, there are actually a lot of variants of both the Hummer and the HMMWV, and the military versions can also be modified based on their roles and operating environments.