Who served as Supreme Commander for the Allied Powers during Japan’s postwar occupation?

Douglas MacArthur served as Supreme Commander for the Allied Powers during Japan’s postwar occupation.

MacArthur also represented the Allied nations at the formal surrender ceremony aboard USS Missouri on September 2, 1945. After the signing, he became the leading Allied authority overseeing Japan’s occupation, reconstruction, demilitarization, and political reforms. His headquarters operated from Tokyo.

The occupation began in late August 1945 and continued until the peace treaty with Japan took effect in 1952. Under MacArthur’s administration, Japan’s military institutions were dismantled, war-crimes trials were conducted, land reform was introduced, and a new constitution was adopted in 1947.

MacArthur was an American general, but the occupation was formally an Allied undertaking. This can cause confusion with Admiral Chester W. Nimitz, who signed the surrender as the United States representative after MacArthur. MacArthur’s title and role were broader: he was the Supreme Commander for the Allied Powers and directed the occupation authorities.