High on the closure list is the Futenma air station, which sits in the middle of an Okinawan city.

CNN: SUMMITS

That was used by the governor of Okinawa to prise considerable concessions from America, including the return of the big Futenma air station.

ECONOMIST: Japan

And what do you think of the possibility that Futenma Air Station ultimately will be relocated to a place other than Henoko as agreed between Japan and the United States?

WHITEHOUSE: President Obama holds a Press Conference with Prime Minister Noda of Japan | The White House

After an Okinawan schoolgirl was raped by three American marines in 1995, President Clinton sought to ease local tensions by promising to close the marines' Futenma air station (used mainly for helicopters) and ten other facilities, handing back a chunk of land occupied by the Americans.

ECONOMIST: Too nice to America?

The three largest bases are Kadena Air Base, White Beach Naval Facility, and Futenma Marine Air Station.

FORBES: As Japan Commemorates A Postwar Return To Sovereignty Okinawans Lament A Day Of Shame

For nearly two decades the closure of Marine Corps Air Station Futenma and the construction of a replacement facility in northern Okinawa have been in the works.

NPR: Report: US Footing Greater Bill For Overseas Bases