The Matador series by Steve Perry is good, as is his other books. If you’ve ever noticed the Khadaji’s Whatcha Reading Thread , the Khadaji in the title is a deceased poster who named himself after one of the main protagonists. Martial arts, guerilla war, intrigue, and a fair amount of philosophizing.
For female scifi authors you can’t really go wrong with CJ Cherryh. Perhaps the best writer of aliens I’ve run across, among other things.