Former President of the Nixon Foundation Sandy Quinn speaks during the opening ceremony of the photo exhibition "Salute to Friendship - Images Narrate China-U.S. Collaboration During World War II" at the Nixon Library in Yorba Linda City of California, the United States, July 23, 2014. The photos were taken by soldiers of the U.S. Army Signal Corps in China during WWII. (Xinhua/Zhang Chaoqun)