Does the AI have visual awareness?
Whenever you see a guard, (sans scripted occasions and the two stealth missions), they see you and fire accordingly. Every AI in the game can be given a custom field of view. So if we want you to be able to sneak past someone, we give him a 180-degree or less FOV and position him so that if you move correctly, you can sneak by him. That being said, RF is not generally about sneaking. The usual method in RF to ensure that someone does not detect you is to shoot him until he no longer detects anything. There are situations in which you go undercover, however, sort of sneaking around in plain view. The challenge there is to discover the ways in which your cover can get blown and learn to avoid those circumstances (read trial and error).
