The Pentagon's only maximum security prison, at the U.S. Army's Fort Leavenworth in Kansas, is one of the facilities being considered for placement of Guantanamo prisoners deemed too dangerous to release. Julie Denesha/Getty Images hide caption

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French President Francois Hollande and U.S. Ambassador to France Jane D. Hartley stand with (from left) Alek Skarlatos, Spencer Stone and Anthony Sadler as they leave the Elysee Palace in Paris. The three American men, along with a British citizen, were pinned with Legion of Honor medals Monday morning for tackling a gunman on a train. Michel Euler/AP hide caption

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U.S. Air Force F-22 Raptors are seen parked at Kadena Air Base on the island of Okinawa in Japan. The U.S. military established a presence on Okinawa during World War II. Yoshikazu Tsuno/AFP/Getty Images hide caption

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A man using a mobile phone walks past an AT&T store, in June. The New York Times and ProPublica report that the telecom giant helped the NSA spy for decades. Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP