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- "Hong Kong's Special Duties Unit (S.D.U.) was formed in 1974. Through training with the S.A.S it has become one of the most potent Special Forces units in the world. The S.D.U. handles police and military operations over the sea, air, and land, specializing in anti-terrorism and hostage rescue."
— Siege In-game description
The Special Duties Unit (Abbreviation: SDU; Chinese: 特別任務連, nicknamed Flying Tigers 飛虎隊) is Hong Kong's main elite paramilitary special operations unit. The SDU is a subdivision of the Police Tactical Unit (PTU) of the Hong Kong Police Force.
The SDU is an available organization in the Tom Clancy's Rainbow Six Siege: Operation Blood Orchid expansion.