Many stars of old time radio have split careers, known by a generation for a particular film performance or TV series role, yet also established and accomplished in the world of radio. Richard Crenna (left) and Gloria McMillan.  While Richard Crenna is known for his work on the TV series Slattery's People and in the Rambo trilogy , entire generations were entertained by his radio work. He started out young, on a Los Angeles series called Boy Scout Jamboree.  After a brief stint in the war it was back stateside and more radio work.  It didn't take long before he began nabbing recurring roles in the best radio series. Crenna began his recurring role as Walter "Bronco" Thompson on The Great Gildersleeve in January of 1945.  After appearing on The Great Gildersleeve , just a month later, he tucked into a small recurring role on A Date with Judy , a comedy starring Louise Erickson. He also appeared a couple of times on This is Your FBI and Yours Truly, Jo...