US Army Rangers are not really out of the question from a scenario point of view, as they operate in a distinclty diffrent fashion from the other Special Operations Forces mentioned. Platoon/Company/Battalion seized assault or blocking actions are still part of their mission profile and that would fit well into CM:SF.
You can't rule them out on the ground of them being part of SOCOM. But if you choose to include them or not is another thing altogether.
[ December 11, 2005, 03:39 AM: Message edited by: Jotte ]