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ARMY is the the fandom across the world for the k-pop group BTS (which by the way, does not mean behind the scenes for the people who think that). BTS is a shortened version of their name which is Bangtan Sonyeondan (Bulletproof boy scouts/bulletproof boys/Bangtan boys) which is most likely where the fanbase name ARMY comes from. If you were ever to meet an ARMY, you would realize that they are the most dedicated fans and will love and support BTS no matter what happens throughout their lives.
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