Fighters from the Free Syrian Army and the Kurdish People's Protection Units battle ISIS militants in Kobani, Syria, in November. U.S. officials haven't said whether they will defend the forces if they are attacked by Bashar al-Assad. Jake Simkin/AP hide caption

itoggle caption Jake Simkin/AP

Relatives of victims of the Sept. 11 attacks are periodically flown down to Guantanamo Bay, Cuba, to witness court proceedings against five men accused of plotting the attacks. For the witnesses of the most recent court session, the experience raised questions about justice, humanity and the ethics of the death penalty. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

The legal case of the alleged Sept. 11 terrorists is slowly grinding its way through a war court at the U.S. naval base in Guantanamo Bay, Cuba. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

Defense attorneys for terrorism suspects at Guantanamo Bay, Cuba, are now allowed to introduce details regarding their clients' interrogations after the so-called "torture report" was released by the Senate Intelligence Committee late last year. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images