[dennisw]

The majority held that they are not abroad since Guantanamo is under the full de facto jurisdiction of the US government.

Incorrect. It is under our military jurisdiction. There are no courts there except for military courts. No law but military law

[AndyJackson]

It is under our military jurisdiction. There are no courts there except for military courts. No law but military law

Well that places it under US jurisdiction. That was the threshold that apparently needed to be crossed.