21 June 2022 SECNAV Visits Innovative Forward Deployed Marines and Sailors with MRF-D 22 DARWIN, AUSTRALIA. – The Honorable Carlos Del Toro, the 78th Secretary of the Navy, visited Marines and Sailors with the Marine Rotational Force-Darwin (MRF-D) on June 18.As part of a battlefield circulation tour in the Southwest Pacific, the Secretary of the Navy (SECNAV) joined MRF-D for awareness...