“We strongly encourage all Airmen, Guardians, and DAF federal employees to receive a booster to protect ourselves, our families, and our communities – that means getting a booster,” said Under Secretary of the Air Force Gina Ortiz-Jones. “The four-hour authorized time may be applied retroactively for those who have already received the booster.”

https://www.af.mil/News/Article-Display/Article/2886289/daf-authorizes-pass-for-covid-booster/ DoD News