The Air Force announced the promotion of 6,668 staff sergeants to technical sergeant for a selection rate of 26.56%.
The outbreak among trainees comes two months after Defense Secretary Pete Hegseth made the annual flu shot optional for U.S. military personnel.
The services sent a "robust set of exception" requests to a new Pentagon policy allowing personnel to decide whether to get the flu shot.
By Patricia Kime
Hegseth also announced that the active-duty obligation for troops who opt to return to service is slashed in half from four years to just two years.
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