The Defense Department is exploring a vast new test and training complex that would wrap around half the planet, reaching across the near entirety of the Pacific Ocean to support large-scale experimentation of advanced warfighting concepts, a move recommended by a classified study on the future of U.S. military superiority. U.S. Indo-Pacific Command plans this summer to propose creation of the Pacific Multi-Domain Training and Experimentation Capability as part of the fiscal year 2022 budget proposal, an estimated $2.7 billion,...