During the course of World War II, tens of thousands of Taiwanese served in the Japanese military. In 1944, Lee Teng-hui, who would become Taiwan's president later in life, volunteered for service in the Imperial Japanese Army and became a second lieutenant. His elder brother, Lee Teng-chin (李登欽), also volunteered for the Imperial Japanese Navy and died in Manila. In addition, over 2,000 women, euphemistically called "comfort women", were forced into sexual slavery for Imperial Japanese troops.