I Edit with photoshop the USN Ship Tree for a better tree, i unit the premium ship in the possible lines and marked this ships about premium, the ships Pensacola and Sevastopol are included in the South Dakota line because is the line that i play. The NF Event Ships don't include in the shiptree lines, are apart.
http://img232.imageshack.us/img232/1134/usnshiptree.jpg
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