There's an excellent biography about Boyd (https://www.amazon.com/Boyd-Fighter-Pilot-Who-Changed/dp/0316796883 https://www.amazon.com/Boyd-Fighter-Pilot-Who-Cha

There's an excellent biography about Boyd (https://www.amazon.com/Boyd-Fighter-Pilot-Who-Changed/dp/0316796883 https://www.amazon.com/Boyd-Fighter-Pilot-Who-Changed/dp/031...) the pilot who formalized using energy & momentum into actual combat techniques. The book is really good reading.