even during single player missions i have needed a knife! but instead i have to use my noisy M16. Update: i understand the conflict with the knife now(you lose the pistol). so what about a bayoneted M16 that for an alternate fire mode thrust forward and stabs or a special unit that when in combat stance has a selection in the action menu to break necks (like "salute" or "sit down"). sure it's not as realistic has a knife but might be a nice substitute. or take the "action menu" idea but with "knife" has the selection. when the action is selected the unit will generate a knife in his hand and stab, slice, or cut.