The VC. were 'irregulars", to my knowledge.
I wasn't there, I would not have gone by the time my lottery number made me available in '73.
By that time it was evident that long war was not going to end with anything but more dead for no reason.
Except some insane idea that Vietnam was part of the Cold War - the only reason sold to us back stateside that we needed to be there.
Thanks for the suggestion on the reads, it not all that important to me since I wasn't there, but I do respect those whom were.