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Chuck Hagel reports for duty at the Pentagon

Drew Angerer / Getty Images

New Secretary of Defense Chuck Hagel is greeted by USMC Lt. General Thomas Waldheuser, who will serve as Hagel's Senior Private Military Assistant, as he arrives for his first day at the Department of Defense, on Feb. 27, 2013 in Arlington.

Hagel was sworn in as the defense secretary at a small, closed-door ceremony on Wednesday after an arduous confirmation battle in the Senate. He becomes the first Vietnam veteran and the first former enlisted soldier to take up the post.