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U.S. Navy reinstates mandatory flu vaccine for deploying sailors, officer candidates
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The U.S. Navy has reinstated mandatory flu vaccination for deploying active-duty sailors, officer candidates (including OCS and Naval Academy), and certain civilian staff, effective immediately. This reverses part of a Pentagon-wide mandate removal from April 2025, which made the flu shot optional across all services. The Navy's new policy, announced via a NAVADMIN on Sunday, requires deployed sailors to be vaccinated before entering any theater or country with an active flu vaccine requirement. It also applies to Navy Reserve personnel in CBRN response roles, mobilized reservists, and healthcare workers. The move follows a June reversal by the Pentagon requiring all enlisted recruits to get the vaccine after an Air Force basic trainee died from flu-like symptoms and 200 others fell ill at a San Antonio boot camp, where only 40% of trainees had been vaccinated. The Navy cites readiness and mission impact as reasons for the mandate. Individual sailors may still seek medical or religious exemptions.
Source report
The Navy is reinstating flu vaccine requirements for deploying sailors, new service members, and certain civilian employees—just three months after the Pentagon removed the mandate across the entire force.
The policy, announced Sunday and effective immediately, makes flu shots mandatory for:
- Deployed active duty sailors
- Trainees in "officer accession programs," including Officer Candidate School and the U.S. Naval Academy
- Directly commissioned officers
- Navy Reserve sailors in Chemical, Biological, Radiological, and Nuclear Enhanced Response jobs
- Reservists mobilized on Title 10 orders directed by the President
- Personnel involved in direct or indirect patient care
The requirement is outlined in a Navy administrative notice (NAVADMIN). It remains unclear how many sailors will be affected. Units under the order have until Jan. 15 to ensure their personnel have received the vaccine.
Reversal of Pentagon Policy
This move is the latest piecemeal reversal of an April order by Secretary of Defense Pete Hegseth, which made the flu vaccine optional for service members—ending a requirement that dated back to World War II.
The Pentagon began backtracking in June, requiring all enlisted recruits across every service to receive the vaccine after an Air Force basic trainee died of flu-like symptoms during an outbreak at the Air Force's boot camp in San Antonio, Texas. The outbreak also sickened 200 other trainees. According to reports from The New York Times and ABC News, only 40% of trainees had received the vaccine after it became optional.
Rationale and Scope
"The influenza vaccine is highly encouraged to prevent outbreaks that can degrade unit readiness, disrupt training schedules, and deployment execution, which adversely impacts mission," the NAVADMIN states.
Deployed sailors must receive the vaccine "prior to entering any theater or country that has an active influenza vaccination requirement." Navy officials did not immediately respond to inquiries about which countries do or do not apply.
The mandate also applies to Navy civilian staff who:
- Run initial entry training
- Provide healthcare with direct patient care
- Work at base daycares or other youth service programs
Exemptions
The NAVADMIN notes that individual sailors may still pursue vaccine exemptions for medical or administrative reasons, such as religious accommodations.
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U.S. Navy Reinstates Mandatory Flu Vaccine for Deploying Sailors and Trainees