In this Sept. 14, 2012 file photo, Libyan military guards check one of the U.S. consulate's burned buildings after a deadly attack on Tuesday, Sept. 11, 2012 in Benghazi. Newly revealed testimony from top military commanders involved in the U.S. response to the Benghazi attacks suggests that the perpetrators of a second, dawn attack on a CIA complex probably were different from those who penetrated the U.S. diplomatic mission the evening before and set it ablaze, killing Ambassador Chris Stevens and another American. The second attack, which killed two security contractors, showed clear military training, retired Gen. Carter Ham told Congress in closed-door testimony. (AP Photo/Mohammad Hannon, File)
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