Al Jazeera America: Gitmo detainee held for 13 years is victim of mistaken identity, says US

Yemeni Mustafa al-Aziz al-Shamiri was foot soldier, not high-ranking Al-Qaeda member, officials say.
http://america.aljazeera.com/articles/2015/12/2/us-guantanamo-prisoner-was-victim-of-mistaken-identity.html