EvilEagle
Pattern Altitude
Richmond VA Guard used to pull that duty some, but they got rid of their F-16's and now they're an associate unit for the 1st Wing at Langley in F-22's, and they don't waste F-22's on this work. I think the NJ Guard out of ACY gets some of this work -- they have a long history of air defense/intercept work dating back to Darts and Deuces.
The 22's do occationally sit, but it really cramps their ability to produce jets - much more than a 4th gen squadron. All the short-notice taskings go to the AD F-15's at Langley.
Pretty much every CONUS unit gets pulled into that job at some point. When I was at Mountain Home, they pulled us out to sit alert/fly CAPs over camp david a few times.