I've been watching a lot of the show 'mash' lately. as a result, I've noticed that 'radar' was not always the company clerk ('clinger' took his place).

I finally saw the episode where radar left. he was sent home due to a family hardship. during the episode, he wrestled with whether or not to stay, but wound up being ordered to go by the camp commander.

'clinger' took over for radar.

I am currently watching the episode 'cementing relationships' which has a guest star by the name of 'joel brooks'. I will have to check, but I believe that is the same actor that plays a psychiatrist in other episodes.