Master Sgt. Diane Ramirez, 28th Medical Operations Squadron flight medicine NCO in charge, administers an H1N1 flu shot to a member of the 28th Bomb Wing staff, Jan. 20. The vaccination is mandatory for all military members and can be received at the immunizations office Monday through Friday, 7:30 a.m. to 4 p.m. (U.S. Air Force photo/Airman 1st Class Matthew Flynn)