President Barack Obama speaks at a memorial ceremony at the Pentagon to commemorate the 15th anniversary of the 9/11 terrorist attacks, Sunday, Sept. 11, 2016. (AP Photo/Manuel Balce Ceneta)
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President Barack Obama speaks at a memorial ceremony at the Pentagon to commemorate the 15th anniversary of the 9/11 terrorist attacks, Sunday, Sept. 11, 2016. (AP Photo/Manuel Balce Ceneta)
