Afghan security forces block the road where Taliban suicide bombers attacked a joint U.S.-Afghan air base in Jalalabad, east of Kabul, Afghanistan, on Sunday, Dec. 2, 2012. The suicide bombers detonated explosives at the gate, and sparking a gunbattle that lasted at least two hours, with American helicopters firing down at militants before the attackers were defeated. (AP Photo/Nasrullah Khan)

Photo by: Nasrullah Khan

Afghan security forces block the road where Taliban suicide bombers attacked a joint U.S.-Afghan air base in Jalalabad, east of Kabul, Afghanistan, on Sunday, Dec. 2, 2012. The suicide bombers detonated explosives at the gate, and sparking a gunbattle that lasted at least two hours, with American helicopters firing down at militants before the attackers were defeated. (AP Photo/Nasrullah Khan)