The photo taken on July 24, 2019 shows the monument for the Flying Tigers in the memorial park of the National Museum of the U.S. Air Force in Dayton, Ohio, the United States. 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)