The Canadian Tactical Wargame is a 1/300 scale game, with 1 tank represented by 1 model. It was used for training by the Canadian Army during the cold war. The Dunn Kempf wargame was similiar and was used extensively for training by the American Army. The rules cover a much wider range of equipment than the Canadian game, but it was not as well written as the Canadian rules.
The 1956 British Army Wargame is completely different and is a map game set at battalion level. It is a detailed look at how real armies of late WWII onwards fight wars. It takes a little bit of effort, but it can produced a most interesting game, perhaps best with all the players one on side, set against an umpire running the game.
Tacspiel is a really detailed map based simulation full of probabilities. To me it looks unplayable, but it is full of real probabilites about attacks working, time taken to do things. The rules are summary of the American understanding of the combat side of the Vietnam war.
Buckle for your Dust is a traditional wargaming set of rules for the Vietnam War that Paddy Griffith enjoyed.
WRG 6th Edition Ancients are the super-detailed set of classic ancient and medieval wargaming rules.