The Third World War, August 1985: A Future History
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Partly it's a gripe against cost & personnel cutting that was going on, other parts look at the sea, land and air forces and the role they would play.
It's an interesting book, obviously some of the predictions didn't happen as expected. It suffers from being really dry in its presentation. Lots of lists of the type of vehicles and weapons in use by the NATO and Warsaw Pact forces.