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Defense Secretary Lloyd Austin is ordering all active-duty and reserve service members to get vaccinated against the coronavirus.

Only vaccines with full authorization from the Food and Drug Administration will be used in mandatory inoculations, Austin said in a letter. For now, that only applies to the Pfizer-BioNTech vaccine, which was granted that status Monday. The letter did not give a deadline for service members to get vaccinated.

The Defense Department previously encouraged immunization, but it was not mandatory. About 65 percent of the 1.3 million service members on active duty have been fully vaccinated, according to Pentagon data from earlier this month.

Here’s what to know.