If the SAS in WWII interests you, then 'Winged Dagger' by Roy Farran is well worth reading.

Farran commanded 'D' Squadron 2 SAS and his book, first published in 1948, was one of ( if not the ) earliest first-hand accounts of the SAS.

Reprinted many times, it's still around in paperback.

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"Stand by to pull me out of the seat if I get hit" - Guy Gibson