DEFENSE DISCUSSIONS U.S. Defense Secretary Robert M. Gates, left foreground, and U.S. Navy Adm. Mike Mullen, right foreground, chairman of the Joint Chiefs of Staff, host a meeting with German Defense Minister Thomas de Maiziere and his delegation at the Pentagon, April 28, 2011. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 489464-G-EJB03-699.jpg Photo Gallery