Aug. 26, 2021 Secretary of Defense Mandates COVID-19 Vaccinations for Service Members Secretary of Defense Lloyd J. Austin III issued a memorandum directing the secretaries of the military departments to immediately begin full vaccination of all members of the department on active duty or in the Guard or Reserve who aren't yet fully vaccinated against COVID-19.
Aug. 9, 2021 Austin Seeks Presidential Approval for Mandatory Troop Vaccinations by Mid-September The COVID-19 vaccine will be mandatory for service members by mid-September, Secretary of Defense Lloyd J. Austin III said in a message to the force.