During his military service, Kwang Jo became a chief Instructor in the 20th infantry division and came into contact with General Choi (the founder of Taekwon-do) when the military began to use that system for unarmed combat. After completing his military service, Kwang Jo traveled to Seoul to see General Choi, who taught him the art. Shortly thereafter, Kwang Jo was named a chief instructor for the International Taekwon-Do Federation (ITF) and taught martial arts instructors from all over Korea and overseas. At the same time, Kwang Jo served as an instructor for the national police department, and taught many military instructors and members of the armed forces. In 1967, the ITF sanctioned him as one of six instructors to demonstrate and promote Taekwon-Do throughout Southeast Asia.
Due to the lockout movements of his traditional martial arts training, however, Kwang Jo injured his body which forced him to move to North America for medical treatment in 1970. After visits with many doctors, Kwang Jo decided to rehabilitate his body withour sergury.
He also studied physical therapy techniques and slowly began to recuperate and heal his condition. It was during this process that Kwang Jo started realizing that the harsher, lockout movements used in conventional martial arts had caused his injuries. As a result, he began to study anatomy, physiology and human-movement sciences.
From 1978 to 1987, as Kwang Jo completely restored his body and health, he incorporated everything he had learned into a new martial arts system called Choi Kwang Do, which translates as “the art (or method) of Kwang Choi.