The main U.S. bases in mainland Japan include Misawa airbase in Aomori Prefecture up in the north of Honshu Island, Yokota Airbase in Tokyo, Yokosuka naval base in Kanagawa Prefecture, Atsugi base in the same prefecture, Iwakuni marine base near Hiroshima, and Sasebo naval base in Nagasaki Prefecture.ixty percent of the US military stationed in Okinawa consists the Marine Corps. Eighty percent of the Marines are young soldeirs, between 18 to 22 years old, who are stationed in Okinawa for only 6 months. Sixty percent of the crimes by the US military is committed by the Marines.