Board Thread:Battle Nations Discussion/@comment-71.91.129.95-20150427160817/@comment-26094192-20150427164250

The missionbox tops  you're referring to requires you to assit the Protein Factory in recoil ridge. However, if you have assisted other buildings in recoil ridge and thus exhausted your potential assists for the day, you will  not be able to complete this mission.

I'd suggest you to wait for a day without assisting any building in recoil ridge, once you see a little clock icon reappears above the protein facotry in recoil ridge, you may tap it to finish the mission.

Or alternatively, you can find a friend who happened to have a Protein factory on his base that you can assist with, this will complete the mission as well.

Good luck,

If all fails, send in a support ticket like peaskye suggested.