Air Force Gen. John Hyten, commander of U.S. Strategic Command, told Congress that the US does not have any defenses against hypersonic weapons being developed by Russia and China.

US Strategic Command is in charge of the nuclear weapons of the USA.

General Hyten says he strongly agrees with the need for a low-yield nuclear weapon that would be launched from US submarines.

China building a Mach 25 wind tunnel and will complete it by 2020

China is building a Mach 25 wind tunnel and will complete it within three years.