Gnr you poor ill advised little man.
The Close Protection Units are for the main made up of RAF Police and RMP. These are not FP (Force Protection) which is mainly a RAF Reg role. The CP units are basically bodyguards for cabinet ministers, military commanders. VIPs and such like. Never met a gunner that has done the course.
Now the SAS, are not made up of 70% Regt, as I've heard quoted, its mainly Paras/Engineers/Infantry Regts of the British Army. Yes there may be one or two RAF Regt at the most, met a lot of guys who have failed it from the regt, but never one thats been there.
There are all sorts of trades in the SAS. Criteria is 3 years minimum service in any force, Army,Navy,Airforce. Physically fit and medically fit. Thats about it. For the SBS you must have the same and also have passed the Marine All Arms Commando course, or be a marine from the start.
Do not mix up the Regt with the Para's/Marines. They are the most advanced infantry/combat units in the forces and have a hell of a lot of history. If you ever mention the Regt in the same breath as those two in the wrong pub you will find out just how to eat your food through a straw. You have been warned.
If you do join the RAF I look forward to meeting you, Im an Instructor. Hopefully I can enlighten you as to the Regt's role and not the bullshit you have been fed by the AFCO. I will give you a good piece of info before you come in, 
Drop the bullshitting. You may know as many people as you want in the military, and keep your ear to the ground, but we, us people in the military can be the biggest bullshitters to you civvies, we find it funny, and people like you take it in then come on sites like this and try to impress us. Gives us a giggle but makes you look a tit.
Hopefully see you soon.
PS. Will definitely remember the name 
