The Guardian has details on Britain's own 'Camp Delta'. They should be familiar to anyone familiar with the case of Ahmed Zaoui - men incarcerated without trial, forbidden to see the evidence against them, and denied fair legal proceedings.
The same principles apply here as to the Zaoui case. if the government has evidence, then it should charge these men in a court of law; if it does not, it should release them. But it cannot continue to imprison people without trial and maintain any shred of moral credability or decency.