One-liner: Provides information about where TRICARE Senior Pharmacy beneficiaries receive their medications and what factors influence where they choose to obtain their medications. 450-character abstract: Provides information about where TRICARE Senior Pharmacy beneficiaries receive their medications and what factors influence where they choose to obtain their medications. The Department of Defense can reduce its pharmacy acquisition costs by shifting prescribing from retail pharmacies to military treatment facility pharmacies and/or the TRICARE mail order pharmacy. The analysis in this report supports that effort.