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Radar O'Reilly is played by Gary Burghoff
Radar's proper name was Walter, and his character was played by Gary Burghoff.
Radar O'Reilly (Gary Burghoff) had an extraordinary ability to detect the arrival of choppers transporting wounded long before anyone else could hear a thing. When Burghoff left the series, the company clerk role was taken up by Corporal, later Sergeant, Klinger (Jamie Farr)
Radar was portrayed by Gary Burghoff in both the film and on television - one of only three actors from the film to reprise their roles on television. The other two were G. Wood and Sal Viscuso.
On M*A*S*H, Radar's uncle died and his mother needed his help since she was otherwise alone tending to the family farm. He was able to leave the army on compassionate grounds. In real life, Gary Burghoff made the choice to leave because he wished to spend more time with his family.