 As the Japanese had post-war political freedom and economic prosperity, the military facilities had a negative economical impact and the people felt cheated, used for the purpose of Japanese and regional security against the communist threat.Despite Okinawa having been formally returned to Japan, both Japan and the United States have continued to make agreements securing the maintenance and expansion of the U.S. military bases, despite protests from the local Ryukyuan population.Although Okinawa comprises just 0.6% of Japan's total land mass, currently 75% of all U.S. military installations stationed in Japan are assigned to bases in Okinawa.