Overview: 2011/09/21 Headlines: Jailed U.S. Hikers Freed in Iran; Troy Davis Requests Polygraph as Execution Looms; Report: U.S. Building Drone Bases in Africa, Indian Ocean Islands; Former Afghan President Killed by Taliban; Oxfam: 3 Million Face Food Shortage in Afghanistan; African Union Recognizes Libyan Government; New Flag Raised at U.N.; Palestinians Rally for Statehood as U.S., Israel Press Opposition; Al Jazeera News Director Resigns over Modifying Iraq War Coverage; Pentagon Marks Repeal of "Don't Ask, Don't Tell" Policy; 7 Arrested in "Occupy Wall Street" Action; Protest-Themed Messages Blocked on Yahoo