Tukgong Hyeong is one of the commando martial art forms. Commando martial art, called Tukgong Musul in Korean, has 4 typical forms, Tukgong Hyeong (comprising of special techniques), Kibon Hyeong (comprising of basic techniques), Yasap Hyeong (comprising of application techniques with army shovel), and Daegum Hyeong (comprising of application techniques with army knife). Master Song was the instructor of commando martial art in a special army in Korea from 1990 - 1991.