How did the military run Japan?

After World War II, Japan was occupied by Allied forces, and its military was disbanded. However, during the post-war period, the U.S. influenced the establishment of a new Japanese government, leading to the creation of a Self-Defense Forces (SDF) that operated under strict constitutional limitations. The military's role was primarily focused on defense rather than offensive operations, reflecting Japan's pacifist constitution. Over time, the SDF has evolved, maintaining a significant presence in Japan's security policy while still operating within the framework of U.S.-Japan alliance.