A perfect example is at Keesler Medical Center on Keesler Air Force Base in Biloxi, Mississippi. During the Centers for Disease Control and Prevention's recommended 15-minute waiting period after a COVID-19 vaccines is given, staff here have been talking to patients about making appointments for routine care that may have been missed due to ...Health Services‧News & Gallery‧About Us‧TRICARE‧Appointments & Referrals‧Driving Directions.