If you're curious in retrospect, I found this to be the best book I've read about the entire Vietnam period. (along with historical context before and after)
Granted, there's a lot we know now that wasn't known at the time (e.g. MACV-SOG's pre-Tonkin activities and concealment of same from Congress, or the serious consideration of tactical nuclear weapons during the Battle of Khe Sanh), but if you're into history it's a good read.
https://www.amazon.com/Vietnam-History-Stanley-Karnow/dp/014...
Granted, there's a lot we know now that wasn't known at the time (e.g. MACV-SOG's pre-Tonkin activities and concealment of same from Congress, or the serious consideration of tactical nuclear weapons during the Battle of Khe Sanh), but if you're into history it's a good read.