Inclusion Criteria:  Inclusion Criteria by Aim:  Aim 1: Primary care clinic visit in VISN 16 or 21  Aim 2: =1 visit(s) at a participating VISN 16 or 21 primary care clinic or CBOC after the start of the trial at their site, and at the time of recruitment, COVID-19 vaccination status is verified as one of the following:  has not initiated COVID-19 vaccination has initiated one of the two mRNA vaccines and is outside the window for the second dose recently completed COVID-19 vaccination (has completed two doses of mRNA vaccination or has completed the single-dose Janssen/Johnson & Johnson vaccine within the past 60 days) Aim 3: Implementation-focused Interviews with VISN 16 and 21 Staff and HCPs  Exclusion Criteria:  Exclusion Criteria by Aim:  Aim 1: Per VISN or VAMC leadership, the clinic or CBOC has extreme staffing shortages such that it would not be feasible or in the best interests of patient care to allow clinic or CBOC staff release time to participate in trainings or other meetings related to the trial  Aim 2: Has initiated COVID-19 vaccination with one of the mRNA vaccines and is within the window to complete the second dose on schedule (< 42 days since dose 1)  Serious allergic reaction or other contraindication to COVID-19 vaccination or other vaccines (e.g., flu vaccine) Currently in hospice care or < 6 months to live No consistent ability to be contacted by phone Participating in another COVID-19 trial or study (research study flag) Moderate to severe dementia as documented in the patient's VA medical record Increased suicide risk as indicated by behavioral health flag Aim 3: Staff or HCPs declines invitation to participate in the interview