Operation Flashpoint (the precursor to ARMA games) is now open source on github, courtesy of Bohemia Interactive:

https://github.com/BohemiaInteractive/CWR

This is the earliest example of an "infantry sim" I can think of. It was one of those games where you could be crawling through acres of a forest to flank an enemy, and then be killed in an instant by a random sentry you neglected to account for. Very realistic, very frustrating, but also very rewarding when you managed to survive.

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