FILE - In this March 29, 2010 photo, reviewed by the U.S. military, a Guantanamo guard keeps watch from a tower overlooking the detention facility at Guantanamo Bay U.S. Naval Base, Cuba. The transfer of prisoners out of Guantanamo Bay has ground to a halt amid a slow Pentagon approval process. That’s caused frustration within the administration and raised doubts that President Barack Obama can fulfill his campaign promise to close the U.S. prison Cuba for terrorism suspects. (AP Photo/Brennan Linsley, File)