CNBC's exclusive interview with Under Secretary of Defense for Acquisition and Sustainment Mike Duffey

CNBC’s Morgan Brennan talks with the Pentagon’s top weapons buyer as the defense industry ramps up production to support current military operations and prepare for future conflicts. Under Secretary Mike Duffey said the Pentagon is working with companies including Lockheed Martin, RTX and L3Harris to significantly expand output of key munitions and components, while strengthening supply chains for critical materials.