Tank
With World War II the multi-turreted tanks proved impracticable, and as the single turret on a low hull design became standard, crews became standardized around a crew of four or five. In those tanks with a fifth crew member, usually three were located in the turret (as described above) while the fifth was most often seated in the hull next to the driver, and operated the hull machine gun in addition to acting as a co-driver or radio operator. Well-designed crew stations, giving proper considerations to comfort and ergonomics, are an important factor in the combat effectiveness of a tank, as it limits fatigue and speeds up individual actions.
Hammerverse
The tanks are supported by smaller "combat cars", armored air cushion vehicles that mount three 2 cm tribarrels. Combat cars have a crew of one driver, one vehicle commander who doubles as a gunner, and two wing gunners. The armor, sensors, redundancy, and artificial intelligence of the combat cars are not as extensive as those on the tanks. The combat car was inspired by Drake's recollection of the "ACAV" version of the M113 Armored Personnel Carrier. A command version of the standard combat car, essentially a steel box on a combat car chassis, exists. The command car's powerful computer and communications gear is useful for unit commanders, although many commanders choose instead to use a standard combat car as their command vehicle.