The Army's most advanced Patriot interceptor appears to have misfired during a key test of the service's new air and missile defense system, requiring a back-up guided missile, an older Patriot variant, to chase and destroy a tactical ballistic missile target last week. During the second flight test of the Integrated Air and Missile Defense Battle Command System (IBCS) limited user test at White Sands Missile Range, NM, the latest-generation, hit-to-kill Patriot Advanced Capability-3 Missile Enhancement Segment interceptor did not...