Master Sgt. Heather Jackson, 914th Communications Squadron, grimaces as Capt. John Copas, 914th Aeromedical Staging Squadron, administers the hepatitis B shot, April 5, 2014 at the Niagara Falls Air Reserve Station N.Y. The Department of Defense recently updated their immunization regulations to require that all service members be immunized against the hepatitis B virus. (U.S. Air Force photo by Staff Sgt. Stephanie Clark)