VIU-55 Munja is a combat engineering vehicle produced by Serbia. VTI did the conceptual design of the Munja general-purpose engineer vehicle and the Technical Overhauling Institute "Čačak" 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. Starting in 2004, about 210 of these vehicles were produced. It was the first armoured vehicle for the Serbian engineer corps, outfitted with special purpose engineer equipment and a respectable armament belonging to the most modern designs of this kind.

Military Technical Institute is a Serbian weapons and aircraft design institute, headquartered in Belgrade, and governed by the Serbian Ministry of Defence. It is a top-level military scientific research institution in Serbia, dealing with research and development (R&D) of new weaponry and military equipment as well as with upgrade of the inventory for both branches of the Serbian Armed Forces: Army and Air Force and Defence.