This is not a bug report but a suggestion that may be considered while developing arma games. I am a successful player of arma games and noticed that in some missions stealth is a prior requirement. While moving close to enemies there is certain distance till which enemies cannot detect you. On moving further close they detect the player. Arma should include stealth kills or melee attacks that do not surprise enemies. This will enable player to complete missions without being detected. Not at all points in the mission, but at some points where there is single enemy patrol or guard or two to three enemies at a distance and not facing each other. Stealth kills is an important factor of military based games because it is practically possible in real. Further, for melee attacks soldiers should carry a knife. If not from close, stealth kills can also be carried out from a small distance by throwing knife on the enemy and then retrieving the knife back from his body.