For me, Gray, its:MASH was the only television show I have ever viewed where the replacement characters were better than those they replaced. Loved Sidney Friedman and another good character was Colonel Flagg, the bumbling intelligence officer. Unlike any other television show, when the time came, MASH had the perfect ending, the war ends.
Colonel Blake > Colonel Potter
and
Trapper John > BJ Hunnicutt
(but I will take Charles over Frank!)