Following Chuck Hagel's exit as defense secretary, the obvious question is who might replace him. One leading possibility: former undersecretary of defense for policy Michèle Flournoy—the defense department's highest-ranking woman ever, ABC News reports. She stepped down in 2012 and now heads a nonpartisan national security think tank thought to have played a big role in President Obama's policymaking, the Washington Post reports. Some administration officials, however, believe she has sided too readily with the uniformed military, which could lead to disagreements with the president, the Post notes. But her perceived hawkishness could play well with Republicans during the Senate confirmation process, Politico reports, and she was on Obama's shortlist the last time around. Other top names in the running: