I've been looking into an old RPG from the early 80's called Recon. It was originally an independent RPG with wargaming elements focused on the Vietnam War. Recon used a percentile dice-based system and was originally published by an independent company. It had a few modules and one supplement called Track Commander, set during the Arab-Israeli conflicts of the 60's and 70's and focused on vehicle combat and counter-terrorist commando raids. A supplement for private mercenaries was advertised but never released.
Palladium eventually bought the rights to Recon and released a revised version of the game that was heavily bowdlerized, with the nations of the world being fictionalized. (For example, the United States was referred to as "Stateside" and the Soviet Union was refered to as "Big Red")
I'm thinking of saving up and buying some hard copies of the original Recon along with Track Commander, but I do know it fetches a high price on Amazon.