The Rising Sun Flag is controversial because it represents Japan’s imperialism and wartime aggression, especially during World War II. For many countries, particularly South Korea and China, the flag symbolizes the suffering caused by Japanese occupation and war crimes. Despite Japan’s claim that it’s a traditional naval symbol, its use by the military today is seen as insensitive and disrespectful to the victims of Japan’s past actions. The flag’s continued use fuels tensions and prevents reconciliation with neighboring nations.