<P> Ronald L. Dapo (born May 8, 1952, Plattsburgh, New York) is an American former child actor who appeared in supporting roles in such television series as the ABC / Warner Brothers situation comedy Room for One More (1962) and CBS's The New Phil Silvers Show (1964). </P> <P> Dapo began acting in 1959 at the age of seven when he played Billy Lacy in John Bromfield's syndicated series U.S. Marshal . That same year he appeared as Ronnie in The Alcoa Hour in the episode "Another Day, Another Dollar" and in "The Greenhorn Story" of NBC's western series Wagon Train starring Ward Bond . He also appeared in the movie - 30 - as Billy, opposite Jack Webb and Whitney Blake as their soon be adopted son . Then in 1960, he appeared as a schoolboy in the episode "A Bullet for the Teacher" on ABC's Maverick starring James Garner, "Ocean's 11" starring Frank Sinatra and Dean Martin </P>

Who played arnold on the andy griffin show