Hegseth eliminated mandatory military flu vaccine requirement in force since 1945

On April 21, 2026, Defense Secretary Pete Hegseth announced that the annual flu vaccine would no longer be mandatory for U.S. military personnel, ending a requirement that had been in continuous force since 1945 — with only a brief pause in 1949. Hegseth characterized the 80-year policy as "overly broad and not rational" and said "we will not force you" to take the vaccine. The change applied to all service members, active duty and reserve, across all branches.

The mandatory flu vaccination requirement had been maintained by successive Secretaries of Defense as a core component of military health maintenance and readiness. Vaccination rates approached 100 percent under the mandate. By making vaccination voluntary, Hegseth fundamentally altered how the military manages seasonal infectious disease in close-quarters institutional environments — barracks, training facilities, ships, and deployments — where flu transmission is particularly rapid.

Within two months of the policy change, a flu outbreak erupted at Lackland Air Force Base in San Antonio, Texas, the Air Force's primary basic training facility. As of mid-June 2026, 222 confirmed cases were reported among recruits, with four hospitalizations. Recruit Keon McDaniel, in his sixth week of Basic Military Training, experienced a medical emergency on June 12 and died at Brooke Army Medical Center. Flu vaccination rates at Lackland had fallen from nearly 100 percent under the mandate to approximately 40 percent after the change. In response to the outbreak, the Pentagon granted exceptions to the policy for the Army, Navy, Air Force, NSA, and Defense Health Agency, requiring vaccines for basic trainees — effectively reinstating the mandate for the highest-risk population while leaving the broader optional policy intact. Senator Roger Wicker (R-MS), an Air Force veteran, said "the reason it was mandatory was to enhance readiness." Representative Joaquin Castro (D-TX) called it "a reckless decision that put troops in harm's way and undermined our military readiness."