I just finished reading a book series from a writer named David Sherman titled "the night fighters (I think it was 6 books.)
In 1967 David Sherman was deployed to a Marine CAP unit in Vietnam. "The Night fighters" is a fictional story based near DaNang.
It was a pretty good read, & I learned a lot about the CAP units (that I was completely unaware of until then)
I got them all on Itunes for $1.99 each, well worth it.
He has a bunch of books, most have been pretty good.