A Humvee is a series of 4-wheeled light tactical military vehicles used for a variety of purposes by nearly all branches of the U.S. Military. 'Humvee' is a nickname for the vehicles, stemming from its official name of 'High Mobility Multipurpose Wheeled Vehicle', or 'HMMWV' in abbreviated form. Although primarily designed for non-combat uses, the Humvee has proved itself well in combat roles as well, and has become one of the quintessential and important components of the U.S. Military's power.
Aside from its intended role as a transport or light scout vehicle, the Humvee can be modified and armed with weapons such as the Browning M2HB .50 caliber heavy machine gun, the Mk. 19 40mm automatic grenade launcher, and the BGM-71 TOW anti-tank missile system, to name a few.
The HMMWV makes some significant appearances in the 2005 film War of the Worlds as part of the Military forces deploying to counter the Martians' invasion. The Humvees, along with other Military personel and equipment that appear in the film, are actual members and equipment of the U.S. Military.