Defense Secretary Robert M. Gates, left, Secretary of State Hillary Clinton and Energy Secretary Steven Chu conduct a press conference to discuss the Nuclear Posture Review at the Pentagon, April 6, 2010. Defense Secretary Robert M. Gates, left, Secretary of State Hillary Clinton and Energy Secretary Steven Chu conduct a press conference to discuss the Nuclear Posture Review at the Pentagon, April 6, 2010. SHARE: Download: Full Size (2.98 MB) Tags: Photo Essays Credit: VIRIN: 955846-M-RCT20-272.jpg Photo Gallery