U.S. captive Bowe Bergdahl was exchanged for other prisoners at Guantanamo Bay . Closing the prison housing terror suspects has long been an American pledge . Battles with Iran and other obstacles have made shutting it down difficult .
U.S. captive Bowe Bergdahl was exchanged for Taliban detainees at Guantanamo Bay . Closing the prison housing terror suspects has long been an Obama pledge . Battles with Congress and other obstacles have made shutting it down difficult .