The RAN had a bloke called LCDR "Psycho" Bates. Made everyone around him lives a misery. The kindest word I could use to descibe him was "nasty". He was eventually shown the door. Ironically his brother was one of the nicest guys I have ever had the privilege to meet who eventually got a command of a warship.
The moral of the story is, there are a miniority of people like this running around in all the services of the world making everyone they come into contact with lives a hell of a time then they leave your life as your next posting comes up. When you look back on them years down the track you think, why didn't I just .........., but at the time it wasn't that easy. I always use to think about "psycho", how would he handle civvy street???