After four years , Martin was discharged from the Merchant Marines in 1947 .
After four years , Martin was enrolled at the University of North Texas , where he would play football with future NFL Pro-Bowler Ray Renfro .
After four years , Martin was discharged from the Merchant Marines in 1947 and enrolled at the University of North Texas , where he would play football with future NFL Pro-Bowler Ray Renfro .