Talk:Expedition/@comment-122.11.215.219-20141009132831/@comment-24980562-20141009134801

Each expedition requires a certain flagship level, a minimum number of ships, certain ship types and in some cases certain equipment and a minimum total fleet level. Fulfil these criteria and you can add/change whatever you want.

Exp.30/31 both require four subs, whether and how you fill the remaining two slots is up to you. In #31's case it's actually recommended to add two more ships if your four subs' combined level isn't enough. And if your subs' levels are too low to fulfil the flagship level requirement, just use a high-level DD or whatever as flagship.