I think there was a mod like this for ArmA 1. You could be a soldier or policeman or civilian. You went around patrolling a town looking for the select few people who were bad guys, hidden among civilians. I don't think it caught on well
the idea isn't a bad one for an unofficial mod, especially considering the strengths of the arma engine in terms of large scale interactive environments...it didn't catch on well because arma(and all subsequent iterations) is technically unstable and outdated.
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