Just thought I'd share that there is a hidden challenge for getting MOAB's as people have said. The challenge resets everytime you prestige so it's quite hard to see how high it goes.

So far the most I've had in a prestige is 8 so I took a pic of the challenge yesterday.

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I'm almost 10th prestige now so when I hit 10th I'll just keep going for MOAb's and see how far the challenge goes and if it gives an emblem since nobody knows for certain.