The regiment that tore it up around Dai Do in 1968

I left country three days before Tet, rotated out, my tour up.

your regiment would most
likely have been the 10th, 11th,12th or 13th Marines.

11th.

The 4th has been, and
to my knowledge still is the Reserve Division.

that was the 5th, not the fourth, as I recall. a high school friend was in the
26th, a unit that fought 56 pitched battles in 52 weeks, according the Stars
and Stripes I read while there. The friend required medication for close to
twenty years later.