When I was just starting out with MP, I was asked to use my units to watch out for and kill a Penetrator. While looking for it, I came across a Lance and casually shot it dead. I was congratulated on a job well done. It took me a while to realize that the mysterious unit I was searching for was the one I had eliminated--as I kept looking afterwards.
Now and again I come across talk about Bantha, Penetrator, Pillager, Roach... for someone who is too new to the game to have known units by those names, is there a resource to quickly translate the old names to the new ones? ...and why were they mass-renamed anyway?