The Pentagon says the transfer of 12 Yemeni nationals and three Afghans brings the total number of prisoners down to 61 at the US facility in Cuba.
The US says it has sent 15 Guantanamo Bay detainees to the United Arab Emirates – the largest single transfer during President Barack Obama’s administration.
Most of inmates have been held without charge or trial for more than a decade.
President Obama wants to close the prison before he leaves office.
