This is the Pilot of the show W*A*L*T*E*R which was never picked up by CBS. They only showed it as a special July 17th 1984. It is about Radar from MASH after the Korean war becoming a police office in St. Louis.
IMDB #: tt0203189
After Walter \"Radar\" O\'Reilly returns home from Korea, he joins the local police force. His adventures include tracking his stolen wallet, breaking up a fight between two strippers, and helping out a homeless boy.