U.S. Secretary of the Navy Carlos Del Toro greets U.S. Marine Corps Col. Christopher Steele, the commanding officer of Marine Rotational Force-Darwin (MRF-D) 22, during a visit with MRF-D 22 at Royal Australian Air Force Base Darwin, June 18, 2022. Secretary Del Toro visited Marines and Sailors with MRF-D 22 and Australian Defence Force personnel as part of the Indo-Pacific battlefield circulation. (U.S. Marine Corps photo by Cpl. Emeline Molla) - U.S. Secretary of the Navy Carlos Del Toro greets U.S. Marine Corps Col. Christopher Steele, the commanding officer of Marine Rotational Force-Darwin (MRF-D) 22, during a visit with MRF-D 22 at Royal Australian Air Force Base Darwin, June 18, 2022. Secretary Del Toro visited Marines and Sailors with MRF-D 22 and Australian Defence Force personnel as part of the Indo-Pacific battlefield circulation. (U.S. Marine Corps photo by Cpl. Emeline Molla)