My favourite from Vietnam:
"One day in a Long War" - Jeffrey Ethell and Alfred Price...it is based on the first day of the Linebaker bombing campaign...the whole book covers ALL missions flown that day, including Randy Cunningham's stoush with 3 Migs in which he became an ace..fantastic book.
"Flying Through Midnight" - John T Halliday....a man who wanted to fly jets in the USAF gets sent to a top secret unit in Thailand, for operations in Laos, flying an old, delapidated C-123 in top secret missions. The book takes a while to get into, until you get to the main mission on the book, and then you just can't put it down and you can't believe what he writes. I managed to google the places he talks about and even some of the people he mentions...all amazing stuff.
"Well done, those Men" - if you want an insight into what the Australian conscript went through in Vietnam, this is your book.