Combined Fighting Systems is a martial arts school in Eau Claire, Wisconsin, founded and led by head instructor Shawn McCarthy. The school teaches weekly classes for the public and for law enforcement, centered on a defensive system designed for street defense. Its curriculum blends multiple disciplines, including Kali-Escrima, boxing, Panantukan, Muay Thai, Silat, Jeet Kune Do concepts, ground survival basics, and Wing Chun principles, with Kali-Escrima serving as the core system.