FILE - This Oct. 24, 2010, file photo shows the entrance to Camp Delta at Guantanamo Bay. Six men long held at Guantanamo Bay arrived Saturday, June 13, 2015,  in Oman, the first movement of detainees out of the U.S. prison for terrorism suspects in five months as Congress considers new restrictions on transfers. The six detainees — all from Oman's war-torn Mideast neighbor Yemen — boarded a flight from the U.S. prison in Cuba on Friday, bringing Guantanamo's population down to 116. The move means President Barack Obama has now transferred more than half of the 242 detainees who were at Guantanamo when he was sworn into office after campaigning to close it. (AP Photo/The Canadian Press, Colin Perkel)