i think they tae kwan don't fight. ok it was a bad joke. but this guy i grew up with was a great fighter and he had learned TKD from his father. His father however was excommunicated from some association for being too hardcore with the fighting and his school closed. he was teaching neck breaking techniques or some such thing to kids. his dad wasn't much of a thinker and therefore had pretty poor judgement. very irresponsible. aside from that i have never seen a school that teaches it for fighting.