Twenty three year old soldier, was referred to me because of extreme mandibular prognathism. Eight years before, the patient had become aware of some protrusion of his mandible. Up until this time, his jaws seemed to have been developing normally. The oblique osteotomy of the mandible was performed. Risdon cable wiring was used in the upper and lower jaw in order to immobilize the mandible by intermaxillary wiring. The patient recovered from the operation, and was discharged from the 1st Army Hospital after 6 months with good functional mandibular relationship. The appearance of the patient was greatly improved.