The military jeep character in Cars is named Sarge.
Sarge is a disciplined, olive-drab military-style vehicle who lives in Radiator Springs. He runs Sarge’s Surplus Hut and takes pride in military routines, patriotic stories, and keeping the town’s residents organized. His gruff personality contrasts with characters such as Fillmore, whose outlook is more relaxed and countercultural.
Sarge is voiced by Paul Dooley in the Cars films. He is recognizable by his upright windshield, military markings, star insignia, and rugged jeep-like appearance. In Cars 2, his military background becomes especially relevant when he helps protect Lightning McQueen, Mater, Finn McMissile, and Holley Shiftwell during the climax in London.
The answer is sometimes confused with Ramone, the town’s lowrider and paint specialist; Mater, the rusty tow truck; or Fillmore, the Volkswagen-style hippie van. Those characters are all Radiator Springs residents, but Sarge is the one specifically presented as the military jeep character.