Approximately 45,000 Japanese troops and 12,000 American service members are participating in the Keen Sword 27 joint military exercises.

From the articleJapan and the US kick off joint drills around islands as regional tensions riseAlso in Japan and U.S. kick off one of their largest joint military drills defending Japan's southwestern islands as tensions with China rise | Fortune, Japan and the US kick off joint drills around islands as regional tensions rise