Security personnel keep watch as U.S. first lady Michelle Obama visits the Mutianyu section of the Great Wall of China, in Beijing

Security personnel keep watch as U.S. first lady Michelle Obama (not seen) visits the Mutianyu section of the Great Wall of China, in Beijing March 23, 2014. REUTERS/Petar Kujundzic (CHINA – Tags: POLITICS TRAVEL) – RTR3I77D