Incidentally, SAC/GB will take SF/SOF NCOs, and not necessarily senior NCOs. They nurture development, tradecraft etc. So in spite of the fun we've had, it's a viable field to consider if you're Ranger/Special Forces/Recon/Raider/SEaL and don't necessarily plan to do a full twenty in uniform.
You won't get as many chicks because you won't be able to tell anybody what you do...but when you're old and the shit's been declassified you'll have some great stories to tell.