** FILE ** In this Dec. 6, 2006 file photo, reviewed by a U.S. Dept of Defense official, a shackled detainee is escorted while being transported inside the detention center at Guantanamo Bay U.S. Naval Base, Cuba. Guantanamo Bay detainees may not challenge their detention in U.S. courts, a federal appeals court said Tuesday, Feb. 20, 2007 in a ruling upholding a key provision in a law at the center of President Bush’s anti-terrorism plan. (AP Photo/Brennan Linsley)