The Missile Defense Agency needs to test faster and try out new, less-mature technologies as the Defense Department attempts to keep pace with North Korea's developing ballistic missile and nuclear programs, according to MDA's No. 2 official. Rear Adm. Jon Hill, deputy director at MDA, said U.S. adversaries have learned to test and fail repeatedly in order to successfully advance their military technologies. He referenced U.S. Strategic Command chief Gen. John Hyten's call for DOD to ignore pressure to be...