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|image=[[Image:Model of South Dakota class battleship.jpg|300px]] ...del of the [[South Dakota class battleship (1920)|''South Dakota''-class]] battleship, including 12 16"/50 Mark 2 guns

|caption=The {{Sclass|Iowa|battleship}} {{USS|Iowa|BB-61|6}} fires a full [[broadside]] of her 16"/50 Mark 7 guns ...ower it is regarded by many as one of the most effective [[naval artillery|battleship gun]]s ever designed.<ref>{{cite web

|service=1920 - 1945 ...p (1920)|South Dakota class battleships]]. They were installed in [[Omaha class cruiser]]s when the intended ships were canceled under provisions of the [[