Designed by Willys-Overland Motors, this vehicle, often just called a "jeep" (From GP, the model numer of a prototype.), is a four wheel drive utility vehicl that serves the Allies in every feasible way, from simple transportation to scouting. Optionally, some models have a mount for a light machine fun. On the Willys Jeeps used by the SAS could be even 4 mounted machine guns.
Willys "Jeep" on Wikipedia