Robert Carpenter, 59th Medical Wing Immunizations Clinic licensed vocational nurse, dilutes the San Antonio Military Health System’s first Pfizer COVID-19 vaccine with saline solution, Dec. 14, 2020, at Wilford Hall Ambulatory Surgical Center, Joint Base San Antonio-Lackland, Texas. The Department of Defense remains committed to protecting service members, civilian employees, and families while safeguarding national security capabilities and supporting the whole-of-nation response to the pandemic. (U.S. Air Force photo by Airman 1st Class Melody Bordeaux)