The U.S. Department of Health and Human Services (HHS), led by Secretary Robert F. Kennedy Jr., has abruptly terminated nearly $500 million in contracts supporting 22 mRNA vaccine development programs under BARDA. This wind-down, impacting major players like Moderna and Pfizer, is justified by claimed inefficacy of mRNA vaccines against upper respiratory infections. Scientists and national security experts warn this move jeopardizes pandemic preparedness and bioterrorism defense, as mRNA platforms enable rapid vaccine deployment. The scientific consensus disputes the decision's rationale, noting robust safety and adaptability data from COVID-19 vaccines. The disruption occurs amid dismantling federal pandemic infrastructure, raising fears about the U.S. readiness against future biological threats.