There’s a great book on Boyd written by an acquaintance of mine(Major Ian Brown) from Marine Corps University’s Krulak Center for Innovation and Future Warfare:
https://www.usmcu.edu/Portals/218/ANewConceptionOfWar.pdf?ve...
It was interesting to learn that John Boyd’s papers were left by him to the USMC’s MCU rather than the USAF in which he served.