Talk:Summer 2015 Event/@comment-176.198.143.252-20150811000114

I skimmed through the explanations and some of the comments, but I coulnd´t find the solution for my problem.

What does this symbol mean? http://www.pic-upload.de/view-27967894/Unbenannt.png.html I got it on all my six ships after I sent them out to E-1 and beat the boss for the 1st time. Now I can´t send them in anymore. I am playing on easy, so shouldn´t ship-locking not apply here?Please help me.