U.S. Navy Adm. Samuel J. Locklear, center, the commander of U.S. Pacific Command; U.S. Marine Corps Lt. Col. Matthew Puglisi, left, the officer in charge of Marine Rotational Force-Darwin (MRF-D); and Maj. William Heiken, the commander of the MRF-D aviation combat element, watch Marine Corps CH-53E Super Stallion helicopters at Royal Australian Air Force Base Darwin in Northern Territory, Australia, April 16, 2014. Locklear toured the base and Robertson Barracks and met with Marines assigned to MRF-D during a visit to Darwin.