181010-N-FG909-00015 NORFOLK (Oct. 10, 2018) Hospital Corpsman 3rd Class Jacob Barnes, from Naval Medical Center Portsmouth, gives a flu shot to a patient at U.S. Fleet Forces Command onboard Naval Support Activity Hampton Roads. It is mandatory for all Department of Defense (DoD) uniformed personnel not medically or administratively exempt to receive the seasonal influenza shot. Flu season lasts from October to March and peaks during February. (U.S. Navy photo by Mass Communication Specialist 2nd Class Michael Fiorillo/Released)