Despite claims of progress in developing a missile defense system capable of intercepting North Korean and Iranian intercontinental ballistic missiles, the Missile Defense Agency has not yet proved the Ground-based Midcourse Defense system can defend the homeland, according to a government watchdog. That blunt assessment is a key finding of an audit by the Government Accountability Office of two classified reports on GMD prepared for Congress by MDA that come as the Obama administration is moving ahead with plans to...