Military officers from more than 30 countries, studying at the People's Liberation Army National Defense University, retraced key sites along the Long March route in Yan'an, Shaanxi Province. Beyond history lessons, they found shared ground—singing "When the Motherland Calls" and engaging with China's vision of win-win cooperation. Follow People's Daily reporter Li Zhuoman and see China through the eyes of international military officers. (Produced by Li Zhuoman, Zhang Yu, Huang Jingjing, Li Mingzhi and intern Yu Jiming)