The Facts

• The US and Japan announced on Sunday their plans to overhaul military ties, which includes upgrading the US Forces Japan to a Joint Force Headquarters.

• The defense chiefs of the two nations also agreed to strengthen US-licensed missile production in Japan as well as co-production of air-to-air missiles.

• US Defense Secretary Lloyd Austin called it "the most significant change to US Forces Japan" and "one of the strongest improvements" in military ties with Tokyo.