1984 Đuro Đaković M-84 main battle tank of the Serbian army. Military Technical Institute Belgrade improved upon the T-72 design and many Yugoslav factories were chosen for production. Most of the production was done in Bosnia (125mm main gun, optics, fire control system) and Serbia (Zastava M86 and M87 machine guns, main gun ammunition, autoloader and mobility systems) , Croatia couldn’t contribute anything to the production so they were chosen to finalize the tank.