SIMI VALLEY, CA -- The U.S. military rapidly developed and deployed still-classified means to defeat hypersonic missiles, the fruit of a focused effort the Pentagon's top technology official spearheaded to find ways to defeat a new class of ultra-fast maneuvering weapons deemed a "huge success." Heydi Shyu, under secretary of defense for research and engineering, cited this previously unreported development as a chief achievement during her tenure, outlining in the broadest terms a capability that deals with one of the...