The Missile Defense Agency effectively cordoned off salient elements of the Ground-based Midcourse Defense system from independent cybersecurity experts attempting to assess its vulnerability during a marquee 2017 flight test, which the Pentagon hailed as a success after intercepting an intercontinental ballistic missile-class target, according to a new report. The Pentagon's top weapons tester, in a report, disclosed a "notable first attempt at an independent cybersecurity assessment" of the GMD system by the Army Research Laboratory Survivability/Lethality Analysis Directorate (ARL/SLAD)...