Secretary of Defense Robert Gates. Alex Brandon/AP hide caption

itoggle caption Alex Brandon/AP

The Chinese People's Liberation Army (PLA) Air Force puts on an air display to mark its 60th birthday in Beijing on November 15, 2009. (Those are not stealth prototypes.) STR/AFP/Getty Images hide caption

itoggle caption STR/AFP/Getty Images

L-R: Defense Secretary Robert Gates, Vice President Biden, President Obama, Secretary of State Hillary Rodham Clinton, and Joint Chiefs Vice Chairman Gen. James Cartwright, during today's briefing. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP