Ditto on Mark Berent
Ditto on Mark Berent. His five F-4 novels are superb. The secondary characters are quite interesting, too. One, for example, is a Green Beret major who--among other things--leads the resistance to a VC attack on a residential compound. It's an incredibly dramatic and intensely written scene--you can smell the cordite.
The author did it all in Nam--see:
<http://www.markberent.com/about.htm>