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In this photo, reviewed by a US Department of Defense official, a Guantanamo detainee's feet are shackled to the floor as he attends a "Life Skills" class inside the Camp 6 high-security detention facility at Guantanamo Bay US Naval Base, Cuba, on April 27, 2009. Canadian Guantanamo detainee Omar Khadr facing a US military tribunal for alleged war crimes has reportedly turned down a plea offer that would have meant five years in prison. POOL/Michelle Shephard = IMAGE REVIEWED BY THE US DEPARTMENT OF DEFENSE = (Photo credit should read MICHELLE SHEPHARD/AFP/Getty Images)

In this photo, reviewed by a US Department of Defense official, a Guantanamo detainee's feet are shackled to the floor as he attends a "Life Skills" class inside the Camp 6 high-security detention facility at Guantanamo Bay US Naval Base, Cuba, on April 27, 2009. Canadian Guantanamo detainee Omar Khadr facing a US military tribunal for alleged war crimes has reportedly turned down a plea offer that would have meant five years in prison.    POOL/Michelle Shephard    = IMAGE REVIEWED BY THE US DEPARTMENT OF DEFENSE = (Photo credit should read MICHELLE SHEPHARD/AFP/Getty Images)