Which three stars from M*A*S*H appeared on Gunsmoke?

Loretta Switt (Hotlips), Alan Alda (Hawkeye), Wayne Rogers (Trapper John),

McLean Stevens (Col. Blake) , Larry Linville (Major Burns), Gary Burghoff (Radar) and, inserted, Harry Morgan (Col. Potter).

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...Loretta Switt, Wayne Rogers, Harry Morgan...