The type was to resemble the standard gun tank, to avoid making it conspicuous: command vehicles are a standard priority target of enemy fire. For that reason the enlarged radio compartment was in the form of a superstructure that looked like a rotatable turret — having the general form of the AVIS-2 but without the asymmetry — but in reality was fixed to the hull. In the front of the "turret" a small gun mantlet was present, that normally lacked any armament but in an emergency situation could be fitted with the portable FM 24-29 machine-gun that was part of the crew equipment. To make sufficient room for an added third crew member, the radio operator, the gear box was moved to the front of the vehicle.