Secretary of Defense Chuck Hagel, shown here in his Pentagon office Friday, explained that transferring Guantanamo Bay detainees required action from many parts of the federal government.
In this June 27, 2006, file photo U.S. military guards walk within Camp Delta at the Guantanamo Bay U.S. Naval Base, Cuba. The U.S. announced the transfer of four detainees from Guantanamo to Oman; one will go to Estonia.
Cooperative captives conduct afternoon prayers inside a communal cellblock at Camp 6 last month at the U.S. Navy base at Guantanamo Bay, Cuba. Six long-time detainees of the prison have been transferred to Uruguay.
A Public Affairs Officer escorts media through Camp X-Ray, the first detention facility to hold "enemy combatants" at the U.S. Naval Station in Guantanamo Bay, Cuba.
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A view of the the U.S. Naval Station base in Guantanamo Bay, Cuba. Guards and prisoners fought Saturday as inmates were moved into individual cells instead of communal housing.
Books in the detainees library at the U.S. Naval Base in Guantanamo Bay, Cuba, are seen in this Aug. 8, 2013, photo. A prisoner at the facility handed over a copy of Fifty Shades of Grey to his lawyer.