Well-trained attackers executed the deadly dawn assault on a CIA complex in Benghazi, Libya, suggesting different perpetrators from those who penetrated the U.S. diplomatic mission the previous night, according to newly revealed testimony from top military commanders. FILE - In this Sept. 14, 2012 file photo, President Barack Obama and Secretary of State Hillary Rodham Clinton walk back to their seats during the Transfer of Remains Ceremony at Andrews Air Force Base, Md., marking the return to the United States of the remains of the four Americans in Benghazi, Libya.