Well, I think that most of you have a wrong image of the Special Force. Special Force are not big and physically dominant killer. This is the image that the SF have since the VietNam. In our day, most of you wouldn't be able to recognize a SF soldier if you encounter one.
The SF soldier are very versatile, in most NATO country, the SF soldier need to talk at least 3 language. Why, because you don't just have some combat operation, you also have Pyscological Warfare to accomplish, peacekeeping ,Civilian Affair mission and Humanitarian mission.
So, the stealth and the AA gun are for different use. In the 91 Gulf War, British SAS use Land Rover (that's noisy !) to make hit and run on Iraqi Scud launch base. The stealth is not really necessary in thoses case because most of the time, when you can hear a 4x4, you can see it too. You use the speed to caught the ennemy by surprise. We are not in a hostage rescue situation...