Senior Airman Brittney Fitschen, 28th Health Care Operations Squadron family health technician, administers a COVID-19 vaccine to Lt. Col. David Herndon, 28th Security Forces Squadron commander, at Ellsworth Air Force Base, S.D., Jan. 15, 2021. First responders, medical staff, deploying forces and others essential to maintaining national security and installation functions are among the first to receive the vaccine, in line with the Department of Defense's vaccine distribution and administration plan. (U.S. Air Force photo by Airman 1st Class Austin McIntosh)