U.S. Marines with Alpha Company, 1st Battalion, 5th Marine Regiment, Marine Rotational Force – Darwin 26, walk to the opening ceremony of Exercise Southern Jackaroo in Townsville Field Training Area, Australia, May 29, 2026. Exercise Southern Jackaroo is a trilateral training event between the armed forces of Australia, Japan, and the United States that builds combined combat readiness and interoperability in the Indo-Pacific through joint operations and live-fire training. (U.S. Marine Corps photo by Sgt. Kyle Chan) - U.S. Marines with Alpha Company, 1st Battalion, 5th Marine Regiment, Marine Rotational Force – Darwin 26, walk to the opening ceremony of Exercise Southern Jackaroo in Townsville Field Training Area, Australia, May 29, 2026. Exercise Southern Jackaroo is a trilateral training event between the armed forces of Australia, Japan, and the United States that builds combined combat readiness and interoperability in the Indo-Pacific through joint operations and live-fire training. (U.S. Marine Corps photo by Sgt. Kyle Chan)