‘It was only a matter of time’: Pete Hegseth’s vaccine rollback faces growing backlash as flu outbreak spreads through Texas military training facility

Texas – A growing flu outbreak at a major military training center in Texas is putting renewed attention on Defense Secretary Pete Hegseth’s decision to end the Pentagon’s long-standing universal flu vaccine requirement for service members.

More than 160 trainees at Lackland Air Force Base in San Antonio have reportedly contracted influenza in recent weeks, according to multiple reports. The outbreak has triggered criticism from lawmakers, public health advocates, and military observers who argue that removing a decades-old vaccine mandate may have left recruits more vulnerable to illness.

The situation has become even more serious following the death of a military trainee earlier this month. While officials have not linked the death directly to influenza, the timing has intensified calls for answers and increased scrutiny of the Pentagon’s new vaccination policy.

Lackland Air Force Base serves as one of the military’s most important training facilities. It is part of Joint Base San Antonio and is the only location where future members of the U.S. Space Force receive basic training. More than 36,000 recruits pass through the facility each year.

According to reports, at least 159 confirmed flu cases have been identified among trainees, with two individuals requiring hospitalization. Officials have acknowledged that the actual number of infections could be higher.

The Air Force confirmed that a localized influenza outbreak has been affecting trainees for several weeks. “Medical professionals and Public Health officials have implemented mitigation measures to isolate and treat symptomatic trainees to reduce further exposure and continue to monitor the situation,” an Air Force spokesperson said.

Officials also said that trainees who have been exposed to infected individuals are being monitored closely and that those who become ill are receiving treatment, including antiviral medications such as Tamiflu.

Debate grows over vaccine policy

The outbreak comes only months after Hegseth announced a major change to military vaccination policy.

For decades, annual flu shots were a routine requirement for service members. Military vaccination programs date back to the 1940s, and mandatory flu vaccination has been in place since 1950.

In April, however, Hegseth eliminated the universal requirement and framed the move as a victory for personal choice. “We’re seizing this moment to discard any absurd overreaching mandates that only weaken our war fighting capabilities. … In this case that includes the universal flu vaccine and the mandate behind it. Your body, your faith and your convictions are not negotiable,” he said.

Later, Hegseth expanded on that position. “Our new policy is simple. If you, an American warrior entrusted to defend this nation, believe that the flu vaccine is in your best interest, then you’re free to take it. You should. But we will not force you. Because your body, your faith are not negotiable,” the Defense secretary said.

The War Department is once again restoring freedom to our Joint Force.

We are discarding the mandatory flu vaccine requirement, effective immediately. pic.twitter.com/9K5W8g0NsD

— Secretary of War Pete Hegseth (@SecWar) April 21, 2026

Following the policy change, vaccination rates reportedly dropped sharply. According to reports citing Air Force officials, only about 40 percent of recruits chose to receive the flu vaccine after the requirement was removed.

Critics argue that decline helped create conditions for the outbreak now unfolding at Lackland.

The Washington Post editorial board sharply criticized the decision, writing, “If it wasn’t already clear why Defense Secretary Pete Hegseth’s decision to eliminate the military’s universal flu vaccine mandate was an exceptionally bad idea, it should be now.”

The editorial also challenged Hegseth’s argument that removing mandates would improve military effectiveness, arguing instead that widespread illness weakens readiness and places additional strain on military operations.

Lawmakers demand answers

Texas Congressman Joaquin Castro has become one of the most vocal critics of the policy shift. “After Secretary Hegseth scrapped the military’s flu vaccine mandate, it was only a matter of time before an outbreak occurred. It was a reckless decision that put troops in harm’s way and undermined our military readiness. At the Lackland Air Force Base in San Antonio, nearly 160 servicemembers are now ill,” Castro said.

The congressman also expressed concern about the death of trainee Keon McDaniel, who suffered what the Air Force described as a medical emergency during his sixth week of training and later died at Brooke Army Medical Center.

An investigation into the cause of his death remains ongoing, and military officials have launched what they describe as a comprehensive medical review. Castro said, “I am especially concerned by the tragic death of a trainee this past week. My office has requested the Department of Defense provide a full accounting of the outbreak and investigate the circumstances of the trainee’s death.” He added, “For the wellbeing of our servicemembers and community, public health policies must be guided by science, not politics.”

Concerns have also come from Republicans. Senate Armed Services Committee Chairman Roger Wicker called ending the universal flu vaccine requirement a “mistake.” “I don’t equate them with COVID shots, which were largely experimental and had not stood the test of time,” Wicker said while defending the long-established flu vaccine. “When I was on active duty and a reservist, I dutifully took my flu shot every year. And as a whole, it made for a healthier” military force.

Pentagon defends the change

Despite mounting criticism, Pentagon officials continue to defend the policy.

Chief Pentagon spokesperson Sean Parnell said the decision followed extensive reviews and risk assessments. He argued that the new approach was designed to balance operational readiness with individual choice while protecting vulnerable populations.

The Pentagon maintains that military branches remain responsible for implementing health protections under the updated guidance and insists that the department remains committed to the health and readiness of service members.

Still, as infections continue to spread through one of the nation’s most important military training centers, the debate over Hegseth’s vaccine rollback is unlikely to fade anytime soon. For critics, the outbreak has become a real-world test of a policy they warned could carry significant consequences long before the first cases appeared.