Corporal Walter Eugene "Radar" O’Reilly is a fictional character in the M*A*S*H novels, film, the television series, the television movie W*A*L*T*E*R and two episodes of the series After M*A*S*H. The character was portrayed by Gary Burghoff in both the film and on television — the only actor from the film to reprise his role on television, aside from G. Wood as General Hammond, and the never-seen PA announcer voiced by Sal Viscuso (though this is debatable).