New Defense Chief Vows to Protect Troops’ Safety, Dignity

New Defense Secretary Ash Carter is vowing to make decisions about sending troops into harm's way "with the greatest reflection and care."

Vice President Joe Biden swore Carter into office from the White House while most of the federal government was closed because of snow. Biden says Carter faces "many tough fights," ranging from battling Islamic State militants to budget cuts.

Carter responded by pledging three commitments. He says he will help President Barack Obama make the best possible decisions about U.S. and global security. Second, he is vowing to protect the dignity, safety and well-being of service members. And he says he will build a force for the future.

Carter is Obama's fourth secretary of defense. He replaces Chuck Hagel, who resigned under pressure.