A lot of people only know of Bruce Lee's movie star persona, but he more than any other martial artists broke the hold of the traditionalists on Asian Martial Arts by challenging the traditionalists. His book the Tao of Jeet Kune Do is well worth the read. His philosophy equally pertains to strategy, military art, etc. Some choice quotes:

“Using no way as a way, having no limitation as limitation.”
“Do not deny the classical approach, simply as a reaction, or you will have created another pattern and trapped yourself there.”
“Having totality means being capable of following "what is," because "what is" is constantly moving and constantly changing. If one is anchored to a particular view, one will not be able to follow the swift movement of "what is.”