Robert M. Gates

Associated Press
FILE - This April 28, 2011, file photo shows President Barack Obama with then outgoing Defense Secretary Robert Gates, left, and then Defense Secretary-nominee Leon Panetta, in the East Room of the White House in Washington. The friction between President Barack Obama and the Pentagon has been particularly pronounced during his six years in office, and seems to be affecting his ability to find a replacement for Defense Secretary Chuck Hagel. Previous Pentagon chiefs have criticized Obama's efforts to micromanage the Pentagon and centralize decision-making in the White House. (AP Photo/Charles Dharapak, File)

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Robert M. Gates

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