Question: What MASH cast member who was known for his work on the Doris Day Show helped write the Army-Navy Game episode of MASH's first season?
Context: With Six You Get Eggroll is a 1968 American romantic comedy film directed by Howard Morris, and stars Doris Day, Brian Keith, Barbara Hershey (in her film debut), George Carlin (in his film debut) and Pat Carroll.  It marked Day's final film role before she starred in the sitcom "The Doris Day Show".  It also marked the first film that was produced by the CBS Television Network's film unit, Cinema Center Films. Winifred Deforest Coffin (October 16, 1911 – December 18, 1986) was an American film actress.  Coffin was an actress who appeared in Hollywood films ("Now You See Him, Now You Don't"), and many television shows including "Adam-12", "The Doris Day Show", "The Debbie Reynolds Show", "Lancer", "The Beverly Hillbillies", "High Chaparral", "Death Valley Days", "Petticoat Junction", "Perry Mason", "Bonanza", "Bewitched", "Honey West", "The Ann Sothern Show". The 2016 Army Black Knights football team represented the United States Military Academy in the 2016 NCAA Division I FBS football season.  The Black Knights were led by third-year head coach Jeff Monken and played their home games at Michie Stadium.  They competed as an independent.  They finished the season 8–5, including defeating Navy for the first time since 2001 in the traditional Army-Navy Game.  They were invited to the Heart of Dallas Bowl where they defeated North Texas in overtime. Rose Marie Mazetta (born August 15, 1923), known professionally as Rose Marie, is an American actress.  As a child performer she had a successful singing career as Baby Rose Marie.  A veteran of vaudeville and one of its last surviving stars, her career includes film, radio, records, theater, night clubs and television.  Her most famous role was television comedy writer Sally Rogers on the CBS situation comedy "The Dick Van Dyke Show".  She later portrayed Myrna Gibbons on "The Doris Day Show" and was also a frequent panelist on the game show "Hollywood Squares".  She was the first major star to be known simply by her first names and is the subject of a documentary film "Wait for Your Laugh" (2017) which features interviews from numerous co-stars, including Carl Reiner, Dick Van Dyke, Peter Marshall and Tim Conway. Briscoe Darling Jr. is a fictional character from "The Andy Griffith Show", an American situation comedy from the 1960s that aired on CBS.  The character was portrayed by actor Denver Pyle, best known for his roles as Grandpa Tarleton on "Tammy", Buck Webb on "The Doris Day Show", and Uncle Jesse on "The Dukes of Hazzard".  Briscoe was the patriarch of the mountain family The Darlings that appeared in several episodes during the run of the series. The Doris Day Show is an American sitcom that was originally broadcast on the CBS Television network from September 1968 until March 1973, remaining on the air for five seasons and 128 episodes.  "The Doris Day Show" was also the title of her radio show which aired from Hollywood in 1952, with "It's Magic" as the theme song. "The Army–Navy Game" is episode #20 of the first season of the TV series "M*A*S*H", originally airing on February 25, 1973; its repeat on September 9, 1973 was the last official telecast in "M*A*S*H"' s first season on CBS.  The episode was co-written by cast member McLean Stevenson ("Lt. Col. Henry Blake"). Edgar McLean Stevenson Jr. (November 14, 1927 – February 15, 1996) was an American actor most recognized for his role as Lt. Colonel Henry Blake on the TV series "M*A*S*H".  He was also recognized for his role as Michael Nicholson on "The Doris Day Show". Marshall Kent (October 6, 1908 - January 15, 1985) was an American television and film actor who appeared in 30 television series or films between 1956 and 1977.  He was best known for his role as "Doc" in the 1958 spoof of "Gunsmoke" presented as an episode of "Maverick" starring James Garner entitled "Gun-Shy."  He also appeared in various other series including "Dragnet" with Jack Webb, "Perry Mason" with Raymond Burr, "The Deputy" with Henry Fonda, "The Gray Ghost", "The Millionaire", "Highway Patrol" with Broderick Crawford, "General Electric Theater", "The Loretta Young Show", "Dennis the Menace", "The Thin Man", "Room 222", "The Wonderful World of Disney", "The Doris Day Show", and "Little House on the Prairie".  He was also a supporting player in films including "Beyond the Valley of the Dolls", "The Decks Ran Red" with James Mason and Dorothy Dandridge, "Teenage Thunder", "Ring of Fire" with David Janssen, and "The Last Voyage" with Robert Stack and Dorothy Malone. "General Hospital" is the longest running American television serial drama, airing on ABC.  Created by Frank and Doris Hursley, the series premiered on April 1, 1963.  The longest-running cast member is Leslie Charleson, who has portrayed Dr. Monica Quartermaine since August 17, 1977, also making her one of the longest-tenured actors in American soap operas.  Former cast member Rachel Ames was previously the series' longest-running cast member, portraying Audrey Hardy from 1964 to 2007, and making guest appearances in 2009 and 2013, the latter for the series' fiftieth anniversary.  Ames made a special appearance on October 30, 2015.  Actors Genie Francis and Kin Shriner, who portray Laura Spencer and Scott Baldwin, are the second and third longest-running cast members, having joined "General Hospital" in February and August 1977, respectively.  Actress Jacklyn Zeman — who portrays Bobbie Spencer — is the fourth longest-running cast member, joining the serial in December 1977.  Actress Jane Elliot, who joined the serial in June 1978 as Tracy Quartermaine, is the fifth longest-running cast member, joining "General Hospital" in June 1978 until her departure in May 2017.  Former cast member Anthony Geary, who portrayed Luke Spencer, was the sixth longest-running cast member, having joined "General Hospital" in November 1978.  The following list is of cast members who are currently on the show: the main and recurring cast members, or those who are debuting, departing or returning to the series.
Answer: McLean Stevenson