Put them in DEA uniforms and take them to one of the fun towns across the borders ;-) Problem solved!
They can fix it!
1. Obtain an old airliner with enough for one more good flight.
2. Find a crew, without family ties so they can disappear forever.
3. Strap the GITMO Guys in for their one-way trip to CONUS.
4. En route, while over a deep portion of the ocean, suffer an in-flight catastrophe.
5. Crew covertly exits the aircraft via parachutes and is rescued by Zodiacs.
6. Plane crashes and slips into the deep blue.
7. USA announces GITMO flight disappears over ocean. Recovery not expected
8. Volunteer crew gets new IDs, retirement annuity accounts and disappears to a remote part of the globe, never to be seen again.
Tell me something like this has never been thought of before.