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.
Panzer II
The Panzer II had a crew of three men. The driver sat in the forward left hull with the gearbox on the right. The commander sat in a seat in the turret, and was responsible for aiming and firing the cannon and co-axial machine gun, while a loader/radio operator sat on the floor of the tank behind the driver. He had a radio on the left and several 20mm ammunition storage bins.