Last week, China's military took its new "ultra-high speed missile vehicle" -- or "hypersonic glide vehicle," if you prefer -- for its first test drive, raising eyebrows among U.S. defense officials. The hypersonic aircraft, capable of maneuvering at a mindboggling 10 times the speed of sound -- that's more than 7,500 miles per hour -- is designed to deliver warheads through U.S. missile defenses.