TRICARE Prime Clinic Chesapeake website 1-757-953-6366 Monday - Friday 7 a.m. - 6 p.m. Saturday - Sunday 9 a.m. - 4 p.m. Minor Holidays (MLK Day, Presidents Day, Columbus Day, Veterans Day) 7 a.m. - 5 p.m. Major Holidays (New Year’s Day, Memorial Day, Independence Day, Labor Day) 9 a.m. - 5 p.m. Closed Christmas Day.