flu vaccinations
U.S. Air Force Tech. Sgt. Richard Sangston, 20th Medical Group allergy and immunizations technician, gives Col. Clay Hall, 20th Fighter Wing commander, his annual flu vaccination, Shaw Air Force Base, S.C., Oct. 11, 2013. All active-duty and medical personnel are required to receive their annual flu vaccination. (U.S. Air Force photo by Senior Airman Tabatha Zarrella/Released)