CHINHAE, Republic of Korea (Jan. 7, 2021) Chief Master-at-Arms Adrian Ramirez is vaccinated for COVID-19 by Spc. William Hunter. Soldiers assigned to the 549th Medical Hospital Center, 65th Medical Brigade administered the COVID-19 vaccine, on a completely voluntary basis, to U.S. Navy Sailors who were identified as frontline personnel by their commands. (U.S. Navy photo by Mass Communication Specialist Seaman Adam Craft)