The United States military plans to return some land in Okinawa to the Japanese government by the end of the year, the largest transfer since 1972, US Defence Secretary Ash Carter says.
Resentment over the US military presence surged this year after an American civilian working at a US base, Kenneth Franklin, was arrested over the murder of a 20-year-old Japanese woman, Rina Shimabukuro.
Carter made the announcement during a meeting with Japanese Prime Minister Shinzo Abe in the capital, Tokyo.
A senior US defense official said the United States plans to return nearly 10,000 acres (4,000 hectares) of land in northern Okinawa, with a formal ceremony for the return set for December 21 and 22.
"It will be a positive development for the alliance, demonstrating the commitment of both governments to the realignment of US forces," said the official, speaking on condition of anonymity.
It was the first announcement of a specific timeline for the transfer, which the US military had said in July it was preparing for.
Okinawa, which was under US occupation until 1972, hosts the bulk of the approximately 50,000 US military personnel in Japan.
Although agreed in 1996, the return of the land was delayed by protesters blocking the construction of helipads.
The Japanese government recently resumed work at the site.
Carter is in Japan to try to soothe anxieties caused by the victory of President-elect Donald Trump, who has called for allies to pay more to sustain US forces, or face their possible withdrawal.