Nukes in arcade

anyone else see a Nuke icon sometimes when spawning a bomber in ground arcade?

Yes and it’s normal , you can have a nuke in arcade

The number on the icon is telling you how much point you have to make to have it (if it tells 1/4, you have made 1/4 of the required battle points for it)

When you finally reached the requirement, the bomber icon will turn into a mushroom cloud like this