My uncle was in the 4/23 and was killed in Jan 1968 by an RPG. Ask your bud if he knew George H Nunez from New Mexico. He was a machine gunner.
Brian said he arrived in country after that date. He also said he never really learned any names other than nicknames. They were always tired, hungry, and always short handed. Casualties were so high, they didn't bother to learn the names of the FNGs because so many fell in the first weeks they were there.
Said RPGs seemed under every bush and the tracks were main target. RPGs would destroy an APC straight away.