"The Great Game" by Peter Hopkirk. It will explain why all those over-promoted Flying Officers who say "This time it's different" haven't got a clue. Mungo. And all of his follow up books.
"Easy Target", Tom Smith. 2nd only to Chickenhawk. Much like Mason, Smith is just a grunt pilot doing a job, not a Lt-Col (Ret'd) trying to justify anything.
"Chickenhawk: Back in the World: Life After Vietnam" is an interesting follow-up. Even if you cut him some slack after Vietnam Mason was still a screw up. The first half you spend thinking "What a nobber", the second half, his time in jail, is very reflective and worth persevering towards.
Avoid anything by Randy Cunningham. Anyone who gives himself a nickname is a c0ck. Eh, Flash?