COVID-19 Vaccine A syringe is prepared with the COVID-19 vaccine at Ramstein Air Base, Germany, Jan. 4, 2021. Health care workers and first responders are the first airmen eligible to receive the vaccine. The vaccine is administered in two doses, with the second dose given four weeks after the first. SHARE IMAGE: Download Image: Full Size (1.98 MB) Photo By: Air Force Senior Airman Jennifer Gonzales VIRIN: 210104-F-BH697-1022M.JPG Photo Gallery