This bill directs the Department of Defense to conduct a comprehensive audit of foreign-made cellular modules in military systems and infrastructure within 180 days of enactment, with a focus on equipment critical to military mobility, logistics, and installation security. The audit must identify the manufacturer, model, and cybersecurity risks of each cellular module found in systems operated by the Pentagon, military branches, and defense contractors connected to Defense Department networks. Within one year, the Secretary of Defense must submit a report to Congress detailing audit findings and describing mitigation strategies such as replacing equipment, isolating networks, or switching to trusted suppliers, along with cost estimates and timelines for these actions. The bill requires biennial progress reports over a six-year period and directs the Government Accountability Office to assess the effectiveness of these mitigation efforts within 180 days of the first report. The legislation focuses specifically on cellular modules produced by entities linked to China or identified as national security risks under existing law.