Per google you’re right. They volunteered a2/3. PRN to get some kind of control. I know 2 guys who volunteered in order to get into elite units which they did.
They simply wanted to serve our country, you don’t have to work so hard to denigrate those of us who enlisted in the military during the Vietnam War era.
As far as getting into elite units, draftees can seek those if they can meet the standards and many did.