/ Digital Air Force Senior Airman Kasey Ginn, medical technician, administers the COVID-19 vaccine to Army Capt. Christine Kasprisin, physical therapist, at Brooke Army Medical Center, Fort Sam Houston, Texas, Jan. 26, 2021. The San Antonio Military Health System is starting the next phase of the Department of Defense’s COVID-19 vaccine rollout -- expanding the scope of who is eligible to get vaccinated against the virus. The San Antonio Military Health System will start the next phase of the Defense Department’s coronavirus vaccine rollout — expanding the scope of who is eligible. Both Brooke Army Medical Center and Wilford Hall will start administering the Pfizer BioNTech vaccine to new populations in the coming days.