As for AA look at this post it is the main guideline on USN AA http://www.navyfield.com/board/view.asp?Num=99573&Sort=A01&Order=re_upday&PageSize=20&Page=1&Ctg_1=&Ctg_2=&Ctg_3=
Also Only 4 CV's on the USN line can use AA are Essex,Ticon,Lexi,and Midway. The Yorktown can fit 5" AA but its not that great since the guns are spread out too far.
-Fox
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