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FILE - In this Aug. 29, 2021, file photo reviewed by U.S. military officials, a flag flies at half-staff in honor of the U.S. service members and other victims killed in the terrorist attack in Kabul, Afghanistan, as seen from Camp Justice in Guantanamo Bay Naval Base, 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/Alex Brandon, File)