Rear Adm. Richard Williams, commander of Navy Region Hawaii and Naval Surface Group Middle Pacific, receives a flu shot from Senior Airman Christopher Mendoza, assigned to the 624th Aero Medical Staging Squad, at the Makai Recreation Center on Joint Base Pearl Harbor-Hickam. It is mandatory for all Department of Defense uniformed personnel not medically or administratively exempt to receive the seasonal influenza shot. (U.S. Navy photo by Mass Communication Specialist 2nd Class Sean Furey/Released)