Archie! Of course, that's one thing I was certainly forgetting. He wasn't even a fully fleshed out character in the books (just a random "Midshipman Kennedy" in a single scene) and it wasn't b/c the actor wanted to leave. Of course, it was insisted upon by Forester's estate, so it wasn't a voluntary decision by the writers, but it still caused plenty of uproar.

Aw, Richie. I liked him. :(