The US is at a pivotal point with China and will need military strength to ensure that American values, not Beijing’s, set global norms in the 21st century, Defense Secretary Lloyd Austin said Saturday. Austin’s speech at the Reagan National Defense Forum capped a week in which the Pentagon was squarely focused on China’s rise and what that might mean for America’s position in the world. On Monday it released an annual China security report that warned Beijing would likely have 1,500 nuclear warheads by 2035, with no clarity on how China would seek to use them. On Friday in...