Board Thread:Questions and Answers/@comment-202.215.76.208-20141206065448/@comment-25674732-20141207164635

there's no minimum level to it, sure you can farm isuzu and grind her to lv 12 for fast AA  upgrade.

if you have time to do so, feel free. as for me, i'm too lazy for it :3. i just do some oreling and hoping for extra carrier for modernization