It is possible. Some heavy changes to the code and it will come "as real as it gets (in the battlefield)"... only problem in so long period is research, but it's not a big problem... only takes a bit more time than in WW2 or WW1, because T-80UM2 Chiorny Orion is not propably very well known outside Russian Secret Service (if they have money for one )...
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Ilja Varha, maker of the SPIII: Moderna
Ilja Varha
Leader (and proud of it!)of the SPMW development team.
Why not two games, divided not by time period, but by type. Both would be 1950-2005. Call one Heavy Metal. This is big nation warfare, Warsaw Pact vs N.A.T.O., Iran-Iraq, Gulf War, India-Pakistan
Vietnam, Falklands, etc. Call the other Brushfire Wars. This is Portuguese colonial wars, the Bush War, SWA, Angolan Civil War, Ethiopia-Eritrea, Somalia, Nicaragua, Chechnaya, etc. Develop two new game engines. Sell both. Make money.