You ignored the main point on what you comment on. To quote myself: afaik, you can keep enemy combatants in prison until after the war
>> The problem is we know now many of the people at Guantanamo do not fit that description.
Of course, most everyone claim to be innocent everywhere. Is there a legal process on a battle field when POWs are taken? (Rhetorical question.)
(I might note that I can't see how Guantanamo is much worse than the rest of the horrible US prison system.)
Here is the US law about unlawful combatants, etc. It seems the US is bound to the Geneva Convention also for them, according to their Supreme court.
https://en.wikipedia.org/wiki/Military_Commissions_Act_of_20...
Please discuss it with the law professors in the Supreme Court, they claim that the US handling also of unlawful combatants must follow the Geneva Conventions.