In this photo reviewed by US military officials, a guard opens a gate while in the background two detainees sit in a rest area behind fencing, within the grounds of Camp Delta 4 military-run prison, at the Guantanamo Bay U.S. Naval Base, Cuba June 27, 2006. The U.S. Supreme Court is preparing a potential landmark ruling that could determine the fate of the military tribunals created by President George W. Bush to try Guantanamo prisoners for war crimes. The ruling by the nation's highest court, which is expected later this week, will be one of the most significant presidential war powers cases since World War Two and could determine whether the tribunals are lawful. REUTERS/Brennan Linsley/Pool
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