You're interested in ARMA: Cold War Assault, a popular tactical first-person shooter game set in the Cold War era. Here's some information about the game and its free download:
Always verify the publisher is “Bohemia Interactive” to ensure you’re downloading the legitimate free version. ARMA- Cold War Assault Free Download
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ARMA: Cold War Assault бесплатно раздают в Steam и GOG ARMA- Cold War Assault Free Download