Staff Sgt. Ruth Furnier, 28th Medical Operations Squadron aerospace medical service craftsman, administers a flu vaccine to Maj. Heath Frye, 28th Communications Squadron commander, on Ellsworth Air Force Base, S.D., Sept. 28, 2011. Flu vaccines are currently only available to active-duty members and essential personnel due to limited supplies. (U.S. Air Force photo by Airman Alystria Maurer/Released)