 VTI has done the conceptual design of the "Munja" general-purpose engineer vehicle and the Čačak-based Overhaul Depot has built the vehicle.The main idea was converting the T-55 tank, using its main structure and subsystems and adding new components, equipment and devices to create a vehicle for entirely different purposes.Good terrain negotiating ability and ballistic protection of T-55 tank were retained, while engineer equipment and armament were refitted.