U.S. Air Force Airman 1st Class Joel Castro, 52nd Aircraft Maintenance Squadron, aerospace propulsion, receives his flu mist during a disease containment plan exercise Oct. 21, 2015, at Spangdahlem Air Base, Germany. The flu mist or flu shot is an annual requirement for service members. (U.S. Air Force photo by Staff Sgt. Christopher Ruano/Released)
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