Talk:Spring 2016 Event/@comment-190.215.132.209-20160505205345/@comment-26374503-20160505212935

let me copy paste one of the my suggestion from one of the tabs above

You will recieve your 1st Air-base after clearing E3. You will recieve your 2nd Air-base after clearing E4.

The 3rd air base can be unlocked by clearing E5 during the Spring 2016 Event. Though E5 is optional, players are recommended to clear E5 before proceeding to E7 for additional air-base firepower.

and theres still plenty of time to recover resources (i myself still in E-3 so i can't say how much resources spent from challenging E5~7)