Have a look at http://www.trainworld.us/NF2/sailor_flowchart/E_Japan_index.html In short arm sailors can be changed to: AA Gunner at lvl 20 OR Torpedoman at lvl 23 OR Gunner at lvl 24 For example: if you want your armsailor to become a torpedoman you dont have to change him to AA Gunner at lvl 20, just wait untill he reaches lvl 23. Study the sailor speciality tree at address given above, it will answer you question fully.
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