1) you can mix them, and they get FULL experience for what they do i.e. gunners get full gun exp, and torpers get full torp exp (trust me, i know) remember folks, generally when your leveling sailors on another nation your crew isnt the same level, which applies penalties and the like
2) they provide NOTHING, the only advantage of having them there is getting experience (and some experts) on them without having to use their nation (again tested)
3) thats why so many people torp whore crews of other nations on fubuki (i do it too)... because there is NO real disadvantage over leveling sailors of the same nation
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