On a visit to Guantánamo, Department of Defense spokesman Joe DellaVedova told me that a series of panels are reviewing the detainees’ files, a process that will take until this year’s end. The review will sort the detainees into three categories: those who will be tried in criminal courts in the US; those who will be released and sent to other countries; and those who “can’t be released and can’t be tried and so have to be held indefinitely…what is being called ‘preventive detention.’”