If you are focusing on small engagements with a platoon or two and maybe a couple vehicles, I'd suggest Force on Force. Several different 'theater' settings, from Cold War Gone Hot (mid 1980s) all the way down to Bush Wars (1960s-1980s), with a detour though Ambush Valley (Vietnam).
You will need a good number of dice, ten of each: d6, d8, d10. d12s are possibly needed, but you don't necessarily need them unless you're playing Mogadishu (another book).
Note that Ambush Alley is written around RELATIVE capabilities, not absolute ones. A heavy AT weapon in 1955 won't even scratch 1990 armor, so the different books have different stats for the same weapons and vehicles.
Ambush Alley rules are focused on the training differences, not the technical differences between gear. An M16 in the hands of a SEAL is the equal of an AK47 in the hands of a SEAL, but a Somali with an M16 is no match for a Delta trooper with an AK.
experiments to find a better way to mount aircraft for wargaming.
