Well, it depends on how you define "decorated". The USS New Jersey has the most battle medals of the four Iowa-class warships, meaning she saw more action than any other US Naval vessel. She doesn't hold the record for being the longest commissioned vessel though.. that's the USS Constitution, I think. On the other hand, the USS Missouri is more famous historically for accepting the surrender of Japanese forces at the end of the Pacific theater of World War II. It's also the battleship moored along the USS Arizona at Pearl Harbor.. and I hear the Memorial organization is wiring the Missouri so people can take a virtual tour of the entire ship over the Internet. Neat!