A day after his confirmation by the U.S. Senate, Chuck Hagel has been sworn in as U.S. defense secretary.
Tuesday's final vote on the former senator's nomination came nearly two weeks after his former Republican colleagues delayed a full vote, raising concerns about his views on the Middle East and the size of the U.S. nuclear arsenal.
Some of them accused Hagel of being too lenient toward Iran and too critical of Israel. Others also found fault with him for opposing the 2007 U.S. troop surge in Iraq.
But Republicans eventually put aside their criticisms and allowed Hagel's nomination to be put to an "up or down" vote.
President Barack Obama praised the confirmation, saying the United States will, in his words, "have the defense secretary our nation needs and the leader our troops deserve."
Hagel assumes the post at a challenging time for the Pentagon, which is facing major budget cuts as the war in Afghanistan comes to an end. The military is also facing the immediate loss of billions of dollars if a series of across-the-board automatic spending cuts, known as the "sequester," takes effect this Friday.
Hagel succeeds retiring Pentagon chief Leon Panetta. Hagel will be the first Vietnam War veteran and the first former enlisted soldier to serve as Pentagon chief.