The US Air Force revealed on Monday that it had conducted a successful test of a hypersonic missile which flew at five times the speed of sound.
The test was carried out off the coast of Southern California on May 14.
The Rapid Response Weapon, known as an ARRW, was launched by a B-52 Bomber.
The USAF said: “Following separation from the aircraft, the ARRW’s booster ignited and burned for expected duration, achieving hypersonic speeds five times greater than the speed of sound.”
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