Navy plans sub-launched hypersonic missiles...
Navy plans sub-launched hypersonic missiles... https://breakingdefense.com/2020/04/navy-targets-sub-launched-hypersonic-test-by-mid-2020s/
Navy Targets Sub-Launched Hypersonic Test By Mid 2020s
For the rest of this year, the Navy is doubling down on its boosters, conducting a series of static fire tests to collect data before another test firing. "We've been crawling, now we're starting to walk where we're going to get the booster design done -- we're going to static test this year -- and then we will start to truly, truly run," Wolfe said.