[backtothestreets]

"Not to doubt you or anything, but it is my understanding that a few NG units were called up for Vietnam. Now most of those were ground units IIRC, so maybe it was different for ANG."

Doubt is sometimes good.  I've had to think back. I do seem to recall three National Guard units being activated, but do not recall the circumstances.  All were support units.  No combat units were activated as I recall.

[Genyous]

On May 3, 1968, the first of four Air Guard fighter squadrons began arriving in Vietnam with their F-100s. In addition, 85 percent of the 355th Tactical Fighter Squadron -- on paper a regular Air Force unit -- were Air Guardsmen. The Air Guard units were quickly integrated into Air Force combat operations and performed well.

http://www.ang.af.mil/History/Features/CallUps.asp