According to the New York Times, the U.S. total cost last year of operating the detention facility or prison at Guántanamo Bay, Cuba exceeded $540 million. This consists of the costs 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.” This does not include classified expenses, presumably a continued CIA presence in Guantanamo.
With only 40 prisoners now housed there, that means each of them costs the U.S. Government at least $13 million per year.
The U.S. “military assigns around 1,800 troops to the detention center, or 45 for each prisoner. The troops work out of three prison buildings, two top-secret headquarters, at least three clinics and two compounds where prisoners consult their lawyers. Some also stand guard across the base at Camp Justice, the site of the war court and parole board hearing room.”
“The 40 prisoners, all men, get halal food, access to satellite news and sports channels, workout equipment and PlayStations. Those who behave — and that has been the majority for years — get communal meals and can pray in groups, and some can attend art and horticulture classes.”
“The prison’s staff members have their own chapel and cinema, housing, two dining rooms and a team of mental health care workers, who offer comfort dogs.”
In 2013 the Defense Department issued an annual report that said the annual cost of operation Guantanamo Bay was $454.1 million. Moreover, that 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 $7 billion.”
This blog has published many posts regarding the legal basis for the U.S. use of this part of Cuba (a 1903 lease for use as a “coaling or naval station only, and for no other purpose”), the annual rent paid by the U.S., but not accepted by Cuba ($ 4,085), and the pros and cons of Cuba’s repeated assertion that the U.S. presence in Guantánamo is illegal.
Now the exorbitant U.S. cost of operating these facilities presents another reason why the U.S. should close these facilities and work out an agreement for return of this territory to Cuba, including a ban on Cuba’s letting Russia or another nation occupy and use the facilities.
On September 18 President Donald Trump, in response to a journalist’s question about the expense of operating Guantánamo, said, “I think it’s crazy. It costs a fortune to operate, and I think it’s crazy.” However, he did not say he would consider closing the Guantanamo facility. Instead, he said , “We’re looking at a lot of things.”
 Rosenberg, The Cost of Running Guantánamo Bay: $13 Million Per Prisoner, N.Y. Times (Sept. 17, 2019).
 Baker, Trump Says ‘It’s Crazy’ to Spend $13 Million Per Inmate at Guantánamo, N.Y.Times (Sept. 19, 2019).