Compared to Trapper, Frank, and Henry Blake (McLean Stevenson), BJ Hunnicutt is a stoically loyal husband while stationed in Korea, deeply missing his wife and daughter since his draft. Despite this distinction, BJ almost cheats on his wife on two separate occasions throughout the series, each time leaving him incredibly remorseful for nearly committing infidelity. These incidents, coupled with a heartbreaking mix-up when BJ’s daughter mistakes a homecoming radar for her father, have BJ wondering how he’s being received at home.
In moments of mutual attraction and loneliness, BJ considers cheating on his wife in season 5’s Hanky Panky and season 8’s War Co-Respondent. He is even more devastated when he realizes how much of his daughter’s life he has been missing out on, leading to him punching Hawkeye when his friend tries to reason with him. BJ leaves camp feeling more confident about his life at home after beating up his best friend, his fears never being more directly articulated and his ultimate destiny not revealed in the sequel series AfterMASH. It seems the secret to resolving marital disputes is to just smack Hawkeye Pierce.
https://www.looper.com/1028189/mash-storylines-disappeared-without-explanation/ MASH storylines that disappeared without explanation