I'm old enough to remember the show when it first aired. About the third season, Dobie and Maynard enlisted in the Army. They didn't last long. Dobie was a great show that still holds up today.
Another oddity on the show was that when Dobie and Maynard went from high school to the local college, it seemed like their whole high school class -- including the teacher, Mr. Pomfritt -- went with them!! I know, I should be expecting reality from a sitcom.