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Preventive Medicine is the twenty-third episode of the seventh season of M*A*S*H, and the one hundred seventieth episode overall.
Starring: Alan Alda (Capt. Benjamin Franklin "Hawkeye" Pierce), Mike Farrell (Capt. B.J. Hunnicut), Harry Morgan (Col. Sherman T. Potter), Loretta Swit (Major Margaret "Hot Lips" Houlihan), David Ogden Stiers (Major Charles Emerson Winchester III), Gary Burghoff (Cpl. Walter "Radar" O'Reilly), Jamie Farr (Cpl. Maxwell "Max" Q. Klinger), William Christopher (Father Francis J. Mulcahy)