Special Forces will mean the National Guard.
The 19th and 20th SFG.
But I don't think you just enlist into them as a Guardsman. I'm pretty sure they're only open to regular special forces soldiers who join the Guard after they're done with active duty. And they're not "one weekend a month, two weeks in the summer" Guardsman. They're full time.
Or the Air National Guard for SOCOM air assets.
[Edited by Dhampy, 2/7/2012 11:35:02 AM]