Influenza vaccine available at Nellis Published Nov. 5, 2014 99th Medical Operations Squadron NELLIS AIR FORCE BASE, Nev. -- The influenza vaccine is now available for all TRICARE beneficiaries -- active duty, retirees and their dependents in the immunization clinic at Mike O'Callaghan Federal Medical Center. The clinic is open Monday through Friday from 7:30 a.m. to 4:30 p.m. and appointments are not needed, as they are a walk-in clinic. For more information call the immunization clinic at 702-653-2410.
