180921-M-UG171-1005 PACIFIC OCEAN (Sept. 21, 2018) The Arleigh Burke-class guided-missile destroyer USS John Finn (DDG 113), left, and the Royal Australian navy Hobart-class air warfare destroyer ship HMAS Hobart (DDG 39) conduct a cooperative deployment in the eastern Pacific Ocean, Sept. 21, 2018. The U.S. and Australia are commemorating 100 years of “mateship” since the two nations fought side-by-side in 1918 during World War I. (U.S. Marine Corps photo by Sgt. Jesus Sepulveda Torres/Released)