The SOS Brigade, also referred to as the SOS-dan (SOS団 (エス・オー・エスだん),
is the name of the club featured in
The Melancholy of Haruhi Suzumiya (涼宮ハルヒの憂鬱 Suzumiya Haruhi no Yūutsu).
The club name is an acronym of
"Sekai wo Ooini moriagerutame no Suzumiya Haruhi no Dan"
(世界を大いに盛り上げるための涼宮ハルヒの団)

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