
Two possible successors to Mr. Panetta if he does step down are former Undersecretary of Defense Michele Flournoy (top) and Undersecretary Ashton B. Carter. Both held positions in the Clinton administration, and both hold positions like Mr. Panetta’s.

Two possible successors to Mr. Panetta if he does step down are former Undersecretary of Defense Michele Flournoy (top) and Undersecretary Ashton B. Carter. Both held positions in the Clinton administration, and both hold positions like Mr. Panetta’s.

**FILE** Then Defense Undersecretary Michele Flournoy testifies on March 16, 2011, on Capitol Hill. (Associated Press)

**FILE** U.S. Defense Undersecretary Michele Flournoy (left) meets with Gen. Ma Xiaotian, the People's Liberation Army's deputy chief of staff (right) during a bilateral meeting Dec. 7, 2011, at the Bayi Building in Beijing. (Associated Press)

Michele Flournoy

**FILE** Then Defense Undersecretary Michele Flournoy testifies on March 16, 2011, on Capitol Hill. (Associated Press)

**FILE** U.S. Defense Undersecretary Michele Flournoy (left) meets with Gen. Ma Xiaotian, the People's Liberation Army's deputy chief of staff (right) during a bilateral meeting Dec. 7, 2011, at the Bayi Building in Beijing. (Associated Press)

The Chinese aircraft carrier Varyag undergoes its second round of sea trials in the Yellow Sea. Michele Flournoy, the Pentagon's undersecretary of defense for policy, says it has been "anticipated for a while." (Digital Globe)

U.S. Army Gen. David H. Petraeus, commander of U.S. and NATO forces in Afghanistan, arrives on Capitol Hill in Washington on Tuesday, March 15, 2011, to testify before the Senate Armed Services Committee on the situation in Afghanistan. At left is Defense Under Secretary for Policy Michele Flournoy. (AP Photo)