The art of the war is complicated, but the science of war is often just a matter of shooting something pain-inducing at the other guy faster and from further away. The Army's Advanced Hypersonic Weapon program wants to do just that, by creating a missile that moves faster than Mach 5, or almost 3,800 miles per hour. That hypersonic future may be just a little further away than expected. During testing of the weapon in Alaska early Monday morning, the rockets propelling the missile exploded four seconds after liftoff. No one was injured, but the cause of the failure has yet to be determined.