So far, only four out of the 275 prisoners held in the remote military base have been brought to trial -- two of them were minors at the time of the alleged events.
Another court hearing is also planned for the end of the week when Yemeni national Salim Hamdan, who worked as a driver and bodyguard for al-Qaeda leader Osama bin Laden, is due to appear.
His appeal to the US Supreme Court resulted in the first military courts in Guantanamo being ruled as invalid in June 2006.
A new hearing is not planned for June, but his lawyers have continued to argue that new tribunals hastily set up by the US Congress in late 2006 still have no authority.
They also argue that Hamdan has been too traumatized by his years in Guantanamo to be tried.
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