Abyssinia, Henry

Wayne Rogers decided to leave the show because he felt that Trapper John had become more of a sidekick to Alan Alda's Hawkeye than the equals they were supposed to be. 20th Century-Fox sued Rogers, but its case collapsed when it transpired that he'd never signed his contract. The reason Rogers cited for this was an archaic "morals clause", which he wouldn't accept unless the studio signed one for him in turn.

Henry is being discharged because he has earned enough points. In reality, the Army stopped using the points system after World War II and doctors were never rotated according to points.