I´m from Argentina.
> I need to know what is the T-72, T-80, T-72 and PT-91 difference
I'd rather say T-80 is a further development of T-64A (T-72 predecessor). Its main difference from T-72 is the engine - T-80U features gas turbine engine GTD-1250. But there are also models with diesel engines. And imroved set of hardware, of course.
PT-91 Twardy - Polish moderniztion of T-72.
> hey CABAL I am looking you topic about the Soviet army it is active yet ?
At the moment I don't have any new pics to add. But, yes, I try to keep it active