Okinawa has long been a site of struggle against U.S. militarism and occupation. Recently activists have been fighting against a U.S. Army helipad. You can read about this struggle HERE and HERE. A group of the activists posted Celebrate People’s History posters along the fence around the helipad as part of the struggle!
Following websites are also useful for the english readers:
http://whyusbasesinokinawa.wordpress.com/
http://www.facebook.com/closethebase
Thanks!