Maj. Cara Grove, 512th Aerospace Medicine Squadron nurse practitioner, administers a flu vaccination to Tech. Sgt. Kaleishia Hoskins, 46th Aerial Port Squadron fuel systems technician, in the Dover Air Force Base, Del., theater Oct. 15, 2011. The Liberty Wing provided more than 700 immunizations that day in preparation for the upcoming flu season, which most commonly peaks in the United States in January or February. (U.S. Air Force photo/Staff Sgt. Andria J. Allmond)