Staff Sgt. Shakeyla Moses, 374th Healthcare Operations Squadron NCO in charge of allergy immunizations, prepares a Moderna COVID-19 vaccine for use, Dec. 28, 2020, at Yokota Air Base, Japan. After rigorous testing and trials demonstrating the vaccine’s safety and effectiveness, the U.S. Food and Drug Administration authorized the use of a COVID-19 vaccine via an Emergency Use Authorization (EUA).