Partner nations of the United States are putting unmanned underwater vehicles to the test in the world's largest maritime exercise this summer . In Southern California, U.S. and Australian navies are working together to deploy UUVs from an amphibious ship during the 2022 Rim of the Pacific exercise, according to Cmdr. Michael Kerrisk, chief of the Australian Mine Warfare and Clearance Diving Task Force. The massive naval exercise features 26 nations, 38 surface ships, four submarines, more than 30...