Reuters topped that the other day:
Pentagon Says Guantanamo Prisoner Improperly Held
WASHINGTON (Reuters) - The Pentagon has determined for the first time that one of the nearly 600 Guantanamo Bay prisoners was improperly held by the United States as an "enemy combatant" and will be released to his home country, the Navy secretary said on Wednesday.
Reading that lede, you might think that the unidentified prisoner was the first man released from Gitmo but he was, in fact, the 157th.
Reuters gets to that in the final paragraph of the story:
Under other procedures, 156 other Guantanamo prisoners have been released or sent to their home countries for further detention, the Pentagon said.
Presumably, those who were released fully were determined not to be enemy combatants just like this week's lucky detainee. Apparently, there was some form of due process there even before the Supremes stepped in.