Support WBURBiden Administration Transfers First Detainee Out Of GuantánamoPlay03:53Download AudioSacha PfeifferJuly 19, 2021 ShareA U.S. military guard tower stands on the perimeter of the detainee camp on September 16, 2010, in Guantánamo Bay, Cuba. There are now 39 detainees remaining after the prisoner transfer on July 19, 2021. (Getty Images)