Marines with Company C, 1st Battalion, 4th Marine Regiment, Marine Rotational Force – Darwin, commence Exercise Southern Jackaroo with soldiers with Company A, 3rd Battalion, The Royal Australian Regiment, Australian Army, Australian Defence Force, May 3 at Townsville Field Training Area, Queensland, Australia. SJ15 is a bilateral training exercise between soldiers from Company A, 3RAR, and the Marines with MRF-D. The rotational deployment of U.S. Marines in Australia affords an unprecedented combined training opportunity with their Australian allies and improves interoperability between the two forces. - Marines with Company C, 1st Battalion, 4th Marine Regiment, Marine Rotational Force – Darwin, commence Exercise Southern Jackaroo with soldiers with Company A, 3rd Battalion, The Royal Australian Regiment, Australian Army, Australian Defence Force, May 3 at Townsville Field Training Area, Queensland, Australia. SJ15 is a bilateral training exercise between soldiers from Company A, 3RAR, and the Marines with MRF-D. The rotational deployment of U.S. Marines in Australia affords an unprecedented combined training opportunity with their Australian allies and improves interoperability between the two forces.