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In page Wayne Rogers:

"

When the writers took the liberty of making Hawkeye a thoracic surgeon in the episode "Dear Dad" (December 17, 1972), even though Trapper was the unit's only thoracic surgeon in the movie and the novel, Rogers felt Trapper had been stripped of his credentials. He decided to leave the show between production of the third and fourth seasons, making his last on-screen appearance in the episode Abyssinia, Henry, which was also the final episode for fellow cast member McLean Stevenson who had portrayed Lieutenant Colonel Henry Blake.[citation needed]