That’s a silly choice to give him. Obviously, he’d choose Gitmo, with their track record for releasing scumbags back into the wild.
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Perhaps its a little silly to imagine the US military would play "catch-n-release" rules with the unrepentant daylight murderer of 13 troops.
There are different "house rules" for the compound in Gitmo--as opposed to the stockade of the local army base.
I think it might be in interesting turn of events.
Enjoy your day.