A method includes providing a plurality of passenger capsules where each of the plurality of passenger capsules has a frame rail-less monocoque hull structure and the plurality of passenger capsules include (a) a first passenger capsule defining four door openings and (b) a second passenger capsule defining two door openings; providing a plurality of front modules; providing a plurality of rear modules; coupling (a) a first front module to a front end of the first passenger capsule and (b) a first rear module to a rear end of the first passenger capsule to provide a first military vehicle variant; and coupling (a) a second front module to a front end of the second passenger capsule and (b) a second rear module to a rear end of the second passenger capsule to provide a second military vehicle variant.

A brake system includes an air-to-hydraulic intensifier configured to couple to a brake actuator that engages a brake to limit movement of a tractive element where the air-to-hydraulic intensifier is configured to receive a supply of air and provide a hydraulic fluid to the brake actuator based on the supply of air to overcome a brake biasing force of the brake actuator to disengage the brake actuator from the brake to permit movement of the tractive element, a hydraulic reservoir coupled to the air-to-hydraulic intensifier, and a valve. The valve includes a first port fluidly coupled to the air-to-hydraulic intensifier, a second port fluidly coupled to the hydraulic reservoir, a third port fluidly coupled to the brake actuator, and a valve gate that is repositionable between a first position that couples the first port to the third port and a second position that couples the second port to the third port.