The inmate population at the U.S. military prison in Guantánamo Bay, Cuba, once stood at nearly 700 but has since dwindled to 40. Sylvie Lanteaume/AFP/Getty Images hide caption
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Guantanamo Bay
Khalid Sheikh Mohammed, seen shortly after his capture during a 2003 raid in Pakistan, is accused of masterminding the Sept. 11, 2001, terrorist attacks that killed nearly 3,000 people. AP hide caption
A humvee passes the guard tower guard tower at the entrance of the U.S. prison at Guantanamo Bay, also known as "Gitmo" in October 2016. October 23, 2016 at the U.S. John Moore/Getty Images hide caption
A flag waves inside Camp 6 at the Guantanamo Bay prison in Cuba last February. Ben Fox/AP hide caption
Heavy rain hits downtown Kingston, Jamaica, on Sunday ahead of Hurricane Matthew's expected arrival. Collin Reid/AP hide caption
A static display shows the belongings of a typical inmate in a prison cell at camp V at the U.S. military prison in Guantanamo Bay, Cuba, in 2013. Joe Raedle/Getty Images hide caption
Jameel Jaffer, deputy legal director of the American Civil Liberties Union, listens during a hearing of the Senate Judiciary Committee on Capitol Hill, in July 2013. Brendan Smialowski/AFP/Getty Images hide caption
Outgoing ACLU Director Reviews Tenure Fighting National Security Battles
A detainee cell in Camp 6 inside the U.S. detention center at Guantanamo Bay, Cuba in February. Ben Fox/AP hide caption
Crew members of the U.S. Navy destroyer USS Jason Dunham load supplies while docked in Guantanamo Bay, Cuba, in 2015. The U.S. and Cuba have restored diplomatic relations, but the U.S. says it remains committed to keeping the base. David Welna/NPR hide caption
President Obama has recently vowed again to close the U.S. prison in Guantanamo Bay, Cuba, which has been used to detain prisoners from the invasion of Afghanistan and the War on Terror since early 2002. Joe Raedle/Getty Images hide caption
President Obama, flanked by Vice President Biden (left) and Defense Secretary Ashton Carter, delivers a statement on the Guantanamo Bay detention camp on Tuesday in the Roosevelt Room of the White House. Mandel Ngan/AFP/Getty Images hide caption
Army Sgt. Bowe Bergdahl leaves a military courthouse Tuesday in Fort Bragg, N.C. Bergdahl was arraigned on charges of desertion and endangering troops stemming from his decision to leave his outpost in Afghanistan in 2009. Sara D. Davis/Getty Images hide caption
Sgt. Bowe Bergdahl will face a general court-martial for desertion. Bergdahl walked away from his outpost in Afghanistan in 2009 and was captured and held by the Taliban for five years. U.S. Army/AP hide caption
A guard tower stands at the perimeter of Camp Delta in the Guantanamo Bay detention center on March 30, 2010. On Sunday, the Pentagon announced five Yemeni detainees had been transferred to the United Arab Emirates. John Moore/Getty Images hide caption
Crew members of the U.S. Navy destroyer USS Jason Dunham load supplies while docked in Guantanamo Bay, Cuba, earlier this year. The U.S. and Cuba have restored diplomatic relations, but the U.S. says it remains committed to keeping the base. David Welna/NPR hide caption