Firemanship was the one I earned while my mom was visiting my dad in Hawaii (mid cruise stop). Rifle and shotgun shooting (including earning my hunter's safety certificate).
My son wants both of the shooting badges and has been practising. It's hard to find MBCs who will do them outside of a camp setting though. I think he is going to have to wait until summer camp to begin them, and hopefully his practise time now will pay off.
He is on a kick now where he says you can do older, retired merit badges. He wants to do one from the early 1900's! And find someone to make a badge for him to wear.