In Vietnam? I didn't think any National Guard units got called up in Vietnam.
That is one of the myths about the Viet Nam War. Several were called up.
My brother in law changed his PMOS and guard unit twice when his unit was called up to avoid going over. We had several individual replacements from guard units.
No offense, but are you series?
Thousands of Army NG personnel were 'in country'.
From the National Guard History:
Company D (Ranger) of the 151st Infantry, Indiana Army National Guard arrived in country in December of 1968. The Indiana Rangers were assigned reconnaissance and intelligence-gathering missions. Operating deep in enemy territory, Ranger patrols engaged enemy units while conducting raids, ambushes and surveillance missions. "Delta Company" achieved an impressive combat record; unit members earned 510 medals for valor and service.
I believe I have read elsewhere (but cannot document right now) that Delta was the most highly decorated company level unit in the entire war.