Senior Airman Nathalia Gillenwater, 28th Medical Operations Squadron allergy and immunizations technician, prepares to administer a vaccination at Ellsworth Air Force Base, S.D., Oct. 3, 2013. The immunizations clinic provides vaccinations to more than 1,500 beneficiaries in the Black Hills area. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)