The OPFOR BT-3 (Boyeveya Ti, or Infantry Carrier), 6x6 APC was the only form of armored transportation available. The first BZT-1,( Boyeveya Zua Ti or Infantry Attack Carrier), was very slow and only had a heavy machine gun as it’s main weapon. The BZT-4 was the result of several different upgrades, to include a new fire control system, AT missile launcher, and a 20mm auto-cannon.  Armor was improved with the addition of add-on panels to the sides and front glacis. It was, however not the most reliable vehicle. It suffered frequent breakdowns and auto-cannon jams. The BZT-5 was a totally new design. The biggest improvement was a 30mm auto-cannon, and laser range finder package. The ammo feed mechanism was much more advanced, as a result, there was a considerable reduction in jams. The BZT-5 mounted a new, larger turret with add-on armor to the front portion. The addition of a KS-3, (Kuai Se, or Fast Snake), anti-tank missile launcher mounted on the turret roof and controlled by the gunner, gave the BZT-5 an extra punch. The troop compartment, still cramped, held an 8 man squad. The rear sides mounted firing ports, in which the troops could use their personal weapons, under armor, to lay down suppressive fire in built-up areas. In addition to the 30mm auto-cannon, there was a 7.85mm coax mounted to the right of the main gun. Trembelov Industries provided the gunners’ sights and the Commanders’ slave sights. A 600 watt infra-red search light is provided for the Commander on the cupola. A Xin Xin 650hp HMT, provided power.