181010-N-FG909-00020 NORFOLK (Oct. 10, 2018) Sailors from Naval Medical Center Portsmouth, prepare flu shots 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. The flu season lasts from October to March and peaks during February. (U.S. Navy photo by Mass Communication Specialist 2nd Class Michael Fiorillo/Released)