The Hypersonic Technology Vehicle (HTV-2) went into self-destruct mode after three minutes into its flight as the flight control system was overwhelmed by aerodynamic forces created when the skin of the projectile peeled off at high speeds.
[thumb]http://www.foxnews.com/scitech/2012/04/23/pentagon-explains-why-hypersonic-mach-20-drone-failed/[/thumb]