The United States Military Government of the Ryukyu Islands (琉球列島米国軍政府 Ryūkyū-rettō Beikoku Gunseifu) was the government in Okinawa, Japan from 1945 to 1950, whereupon it was replaced by the United States Civil Administration of the Ryukyu Islands. The government was headed by the military governor (軍政長官 Gunsei Chōkan) and his second-in-command, the Chief Military Government Officer (軍政府長官 Gunsei-fu Chōkan). They were assisted by the Deputy Commander of the Military Government (軍政府副長官 Gunsei-fu Fuku-chōkan).