(Editor's Note: This story has been updated to reflect that the National Defense Panel's meeting is at the Pentagon, not the United States Institute for Peace as originally reported.) The National Defense Panel, charged by Congress with assessing the upcoming Quadrennial Defense Review, will convene its inaugural meeting Tuesday at the Pentagon in a closed session expected to include briefings from defense officials. The meeting comes days after Defense Secretary Chuck Hagel's issuance of classified guidance for the QDR,...