“The Chinese have now done several dozen successful hypersonic (missile) tests… we just cannot (ignore),” Greaves told a meeting held by the Missile Defense Advocacy Alliance.
Under Secretary of Defense for Management and Engineering Michael Griffin agreed that China had carried out dozens of successful tests and noted that Russia was successfully developing hypersonic systems too.
“Hypersonic missiles [are] being developed by both China and Russia. We are concerned about both … When they have done dozens of tests we have not done that is a concern,” he said.
WATCH: China Test-Launch Sky Star-2 Hypersonic Waverider Vehicle
Griffin also noted that both Russia and China had pushed ahead with operationalizing research on hypersonic weapons systems.