U.S. military efforts to develop a hypersonic strike capability are not driven by the higher pace of flight testing of such technologies by Russia and China, according to the Defense Department, which argues the effort to mature technology for a Conventional Prompt Global Strike capability, including ground tests and computer modeling -- is "much more aggressive." The Defense Department, in previously unreported written responses from then-Defense Secretary Ash Carter to House lawmakers in 2016, is "monitoring other international hypersonic efforts...
