Zeroed in: The weapon, which could look similar to this Falcon HTV-2, left, was fired from Hawaii, glided south westwards through the upper atmosphere over the Pacific at 'hypersonic speed' before hitting its target on the Kwajalein atoll in the Marshall Islands - some 2,500 miles away. A hypersonic flying missile that can strike a target anywhere in the world in just 30 minutes has been unveiled...