Secretary Gates talks with the press on the Great Wall of China. Secretary of Defense Robert M. Gates talks with the press on the Great Wall of China in Mutianyu, China, on Jan. 12, 2011. Gates wrapped up a 4-day trip to China by visiting the People's Liberation Army 2nd Artillery Group and the Great Wall. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 783685-M-MSX59-948.jpg Photo Gallery