The KLA failed to initiate Operation Eagle, a plan to liberate the Korean Peninsula by first attacking the capital region (Seoul and Incheon), on August 18, 1945. The Office of Strategic Services of the United States also promised to assist the KLA with warplanes, submarines, and airborne troops during the operation. However, the plan failed due to the early surrender of Japan on August 15, 1945. The Provisional Government also faced heavy oppositions against the United States military government in Korea after World War II. The government of the Republic of Korea was established on August 15, 1948, and the Provisional Government was disbanded officially.