Patients sit at a mass vaccination center in the Anderson Field House gym on Joint Base Langley-Eustis, Virginia, March 29, 2021. Officials at the McDonald Army Health Center opened the mass vaccination center to expand their capacity to provide the COVID-19 vaccine to beneficiaries. (U.S. Air Force photo by Staff Sgt. Joshua Magbanua)

U.S. Army 1st Lt. Kristin Salcedo, McDonald Army Health Center Orthopedic Clinic officer in charge, processes a patient before administering the COVID-19 vaccine on a patient at a mass vaccination center in the Anderson Field House gym on Joint Base Langley-Eustis, Virginia, March 29, 2021. Staff at the gym established precautionary measures for the vaccination center, including separate entrances for patients and users of the gym. (U.S. Air Force photo by Staff Sgt. Joshua Magbanua / This photo has been modified to protect personal information)

U.S. Army 1st Lt. Kristin Salcedo, McDonald Army Health Center Orthopedic Clinic officer in charge, administers the COVID-19 vaccine on a patient at a mass vaccination center in the Anderson Field House gym on Joint Base Langley-Eustis, Virginia, March 29, 2021. Staff at the vaccination center came primarily from the McDonald Army Health Center; augmentees were drawn from the 7th Transportation Brigade (Expeditionary). (U.S. Air Force photo by Staff Sgt. Joshua Magbanua / This photo has been modified to protect personal information)

U.S. Army Spc. Andre Gee, 7th Transportation Brigade (Expeditionary) medic, checks on his patients after administering the COVID-19 vaccine at the Anderson Field House gym on Joint Base Langley-Eustis, Virginia, March 29, 2021. Patients are instructed to remain at the clinic for 15 minutes following inoculation to monitor for any adverse effects. (U.S. Air Force photo by Staff Sgt. Joshua Magbanua)

Olivia Baldwin, a licensed practical nurse from the Williamsburg Community Based Medical Home, stamps a patient’s medical records at a mass vaccination center in the Anderson Field House gym on Joint Base Langley-Eustis, Virginia, March 29, 2021. Vaccines are available to enrolled beneficiaries of McDonald Army Health Center. (U.S. Air Force photo by Staff Sgt. Joshua Magbanua / This photo has been modified to protect personal information)