The Defense Department "lacks comprehensive guidance" for sustaining and maintaining the Missile Defense System -- a sprawling collection of radars, launchers and command and control systems -- that, if not corrected, places at risk the readiness of the nation to defend against long-range missile threats. That is a key finding of congressional auditors in a new report commissioned by a Senate panel two years ago that calls for DOD to develop comprehensive guidance for oversight of MDS sustainment as well...