Marines and soldiers will prepare a detention center at Guantanamo to hold up to 30,000 migrants.
The latest release brings the total number of men detained at Guantanamo to 15. It held approximately 800 at its peak.
The plea agreements would spare Khalid Sheikh Mohammed and two co-defendants the risk of the death penalty in exchange for guilty pleas.
The drills have been seen as a show of strength by Moscow as the U.S. and other Western countries support Kyiv in Russia's war on Ukraine.
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