– Aviation Week – There must be a typo. That’s the understandable first thought that could pass through anyone’s mind upon seeing the U.S. Government Accountability Office’s (GAO) new cost estimates for the Navy’s proposed Air and Missile Defense Radar (AMDR), which is meant to combine S- and X-band radars for simultaneous and unmatched air and ballistic missile defense (BMD). The Navy plans to first put the AMDR on its DDG-51 Flight III destroyers. AMDR’s total price tag is now estimated at about $5.8 billion, compared to the $15.2 billion projected by GAO last year.