John Mulcahy was a secondary protagonist in the novel MASH: A Novel About Three Army Doctors and the movie based on the novel. A Roman Catholic priest, Mulcahy served as the chaplain for the 4077 MASH. His duties consisted of ministering to the men and women of the unit, as well as the patients that flowed through the hospital. This included giving the last rites to those who passed on. Mulcahy remained in the camp as Hawkeye Pierce and Duke Forrest were rotated out of the camp, and blessed the jeep the two men were taking before they left.