Hegseth ends universal flu vaccine mandate for U.S. troops

Pete Hegseth ended the military’s universal annual flu shot requirement, making the vaccine voluntary effective immediately for all active-duty service members and Department of War civilian personnel. The April 20 memorandum marked a sharp turn in a force health policy long tied to readiness, especially in crowded barracks, aboard ships and during deployments where influenza can spread fast.

Hegseth cast the change as a matter of individual liberty. In a social-media video, he said the old rule was “overly broad and not rational,” and added that troops may still choose vaccination. “Your body, your faith and your convictions are not negotiable,” he said. The memo also gives the services 15 days to ask that the requirement remain in place for their own personnel, leaving room for uneven rules across branches and commands.

The policy change lands against a backdrop of military health guidance that still treats immunization as part of force protection and readiness. The Defense Department’s own guidance says vaccination programs are central to keeping forces fit for duty, and the Defense Health Agency’s Immunization Healthcare Division supports the department’s immunization programs. The Centers for Disease Control and Prevention continues to recommend a flu vaccine for everyone 6 months and older each season, ideally by the end of October, and says flu vaccines are available for people in that age group during the 2025-2026 season.

The military has faced this fight before, most visibly during the COVID-19 pandemic. More than 8,400 troops were separated in 2021 for refusing the COVID vaccine mandate before Congress rescinded it and the Pentagon formally removed the requirement in January 2023. Since then, Pentagon documents in 2025 and 2026 have shown continuing efforts to restore records and correct separations tied to that mandate, underscoring how vaccine policy has become entwined with personnel records, religious objections and questions of authority inside the force.

The timing also matters. Public health officials have described the recent flu season as particularly severe in the United States, and military-health researchers published a March 1, 2025 surveillance snapshot examining influenza vaccine effectiveness among active-component service members from December 1, 2024 through February 8, 2025. Taken together, the change puts a politically charged emphasis on personal choice into direct tension with the Pentagon’s longstanding case for force health protection, just as influenza remains a live readiness issue for troops who may be asked to deploy with little margin for sickness.