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FILE - In this Feb. 6, 2016, file photo, an Army captain walks outside unoccupied detainee cells inside Camp 6 at the U.S. detention center at Guantanamo Bay, Cuba. The 20th anniversary of the first prisoners' arrival at the Guantanamo Bay detention center is on Tuesday, Jan. 11, 2022. There are now 39 prisoners left. At its peak, in 2003, the detention center held nearly 680 prisoners. (AP Photo/Ben Fox, File)