People view the Curtiss P-40E Warhawk used by the Flying Tigers in the World War II Gallery of the National Museum of the U.S. Air Force in Dayton, Ohio, the United States, on July 24, 2019. The Flying Tigers, a U.S. air squadron composed of pilots from the United States Army Air Corps, Navy, and Marine Corps, helped the Chinese fight Japanese invaders in World War II. The National Museum of the U.S. Air Force displays more than 360 aircrafts and thousands of historical items that bring history to life. In its World War II Gallery, many exhibits reveal a memorable part of China-U.S. cooperation when the two countries joined hands in fighting fascism and safeguarding world peace. (Xinhua/Zhang Fengguo)