Further corrections; a reader e-mails (actually, I have many emails along these lines overnight):
Sorry to correct even further, but ALL the battelships have been decommissioned. Wisconsin could possibly be re-commissioned, but Iowa, New Jersey and Missouri have been either damaged (Iowa, 1987 explosion) or demilitarized for museum display to an extent that they would be really, really hard to reactivate. Damn it.
Here’s the Navy’s battleship-status list.