On Thursday, the parole board at Guantánamo said prisoner Hayl Aziz al-Maythali no longer posed a danger, and cleared him for release. The 39-year-old Yemeni was once accused of having plotted the 9/11 attacks and had been considered one of the prison’s “forever prisoners”—those least likely to ever be released. Thirty-four of the remaining 76 detainees at Guantánamo have now been cleared for release. Some have been cleared for years.