"Then there is Guantánamo Bay, where the expense now works out to…

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https://www.nytimes.com/2019/09/16/us/politics/guantanamo-bay-cost-prison.html
"Then there is Guantánamo Bay, where the expense now works out to about $13 million for each of the 40 prisoners being held there.

According to a tally by The New York Times, the total cost last year of holding the prisoners — including the men accused of plotting the Sept. 11, 2001, attacks — paying for the troops who guard them, running the war court and doing related construction, exceeded $540 million.

...the military assigns around 1,800 troops to the detention center, or 45 for each prisoner.

The estimated annual cost of $540 million covers the 12-month period that ended last Sept. 30 and does not include expenses that have remained classified, presumably including a continued C.I.A. presence.
...
The 2013 report put the total cost of building and operating the prison since 2002 at $5.2 billion through 2014, a figure that now appears to have risen to past $7 billion."

https://www.nytimes.com/2019/09/16/us/politics/guantanamo-bay-cost-prison.html