MERDC camo came in during the mid-late 70s, although 'hard edge' definition of the respective colours, rather than the 'fade-in' spray painting gave, was apparently confined to those units who's commander insisted rocks be painted white and that sort of thing in the casernes.
While after the fact revelations did demonstrate it was the T-64 in service... everyone expected hordes of T-72s... given the inspiration is the novel, then T-72s is what you get.
Bearing in mind BF seem to test the waters with limited releases and a thin supplement (Vietnam, Arab-Israeli), I would imagine more toys will turn up if it's a success.
I'm all for fictional inspiration for ranges, so if a 28mm manufacturer is reading this, a line of figures based on G.I. Blues, Sgt. Bilko and Gomer Pyle USMC, would float my boat.