Battleship Trivia follows (not to be confused with the game...)
BB-55 (North Carolina) was the lead ship of two battleships of the North Carolina Class of battleships... BB-56 (Washington) was the other member.
The North Carolina Class was followed by the South Dakota Class (BB-57 - BB-60)
Big Mo (BB-63 is the third member of the Iowa Class of battleship (BB-61 Iowa, BB-62 New Jersey, BB-53 Missouri, BB-64 Wisconsin, BB-65 Illinois and BB-66 Kentucky - last two never completed)
In case you were wondering after all this battleship trivia, BB-39 Arizona, the only battleship still commissioned in the US Navy, was the second of the Pennsylvania Class.
And a final pic...
I had always predicted she would be the last, and will never be decommissioned.