CBS fired one original MASH character for the wrong reasons after the character appeared throughout season 1. Running for 11 seasons, MASH was no stranger to casting changes. It experienced a mass exodus in its first few seasons, with founding characters such as Henry Blake, Trapper John McIntyre, and eventually Frank Burns being written out of the series. All of them had their respective replacements in order for 4077 to continue functioning. However, before Henry Blake was even killed in the MASH season 3 finale, the sitcom had already lost a primary character.
https://screenrant.com/mash-timothy-brown-spearchucker-jones-fired-wrong-why/