there are over 17 different variants of the humvee, including missile and rocket platforms.
snow tracks
A partial listing of HMMWV versions
M56 Coyote Smoke Generator Carrier
M707 HMMWV
M966 HMMWV TOW Armored
M996 Mini-Ambulance, Armored
M997 Maxi-Ambulance, Armored
M998 Cargo/Troop
M998 HMMWV Avenger
M1025 Armament Carrier, Armored
M1026 Armament Carrier, Armored W/W
M1035 Soft-Top Ambulance
M1036 TOW Armored W/W
M1037 S-250 Shelter Carrier
M1038 Cargo/Troop Carrier W/W
M1042 S-250 Shelter Carrier W/W
M1043 Armament Carrier, Up-Armored
M1044 Armament Carrier, Up-Armored W/W
M1045 TOW Up-Armored Armor
M1046 TOW Up-Armored Armor W/W
M1069 Tractor for M119 105-mm Gun
M1097 Heavy
M1097 Heavy HMMWV Avenger
M1109 Up-Armored Armament Carrier
HLONS
http://en.wikipedia.org/wiki/HMMWV