It's that time year again: the Fan Army Face-Off!
Each year, Billboard asks the question--which fan army is strongest? In the high-stakes first round, two the strongest fan bases are going head-to-head. Britney Spears' Britney Army is facing 5 Seconds Summer's 5SOSFAM. Can Britney's devoted followers team up to take down the unwavering loyalty 5SOSFAM?
Get your votes in quick, as round 1 ends on Wednesday (July 25) at 11:59 p.m. ET. Click here to vote for your favorite fan army!