Vaccination Education Navy Petty Officer 3rd Class Kaley Bitz teaches a fellow sailor how to administer a flu vaccine during a command immunization at Polaris Point, Guam, Oct. 20, 2017. Bitz is a hospital corpsman. Navy photo by Petty Officer 1st Class Jamica Johnson SHARE: Download: Full Size (1.29 MB) Credit: Petty Officer 1st Class Jamica Johnson VIRIN: 171020-N-JN506-014C.JPG Photo Gallery