I'll second LOW LEVEL HELL by Hugh Mills as an excellent read. 'Chickenhawk' may or may not be suspect, but it's also a great book.
A few others I've read recently:- 'Snake Pilot' by Randy Zahn, 'Taking Fire' by Ron Alexandre (very good) and a fixed wing read 'When Thunder rolled' by Ed Rasimus (F105 over North Vietnam).
Recommend all of them.