This legislation, known as the "MISSION Rx Act," seeks to significantly lower prescription drug costs for military families, veterans, and federal government procurement. It achieves this by amending titles 10 and 38 of the United States Code, specifically targeting "selected drugs" that are subject to the Drug Price Negotiation Program established under the Social Security Act, which governs Medicare Part D. For eligible covered beneficiaries under the TRICARE program , the bill mandates that their cost-sharing amount for a selected drug cannot exceed the amount paid by a Medicare beneficiary for that same drug. Similarly, veterans' copayments for selected drugs are capped at the Medicare Part D beneficiary copayment amount. Furthermore, the bill stipulates that the maximum price for selected drugs procured by Federal agencies , including the Department of Veterans Affairs, cannot exceed the "maximum fair price" negotiated through the Medicare Drug Price Negotiation Program. These provisions apply to both existing and future master agreements for drug procurement, ensuring that the benefits of Medicare's negotiated drug prices are extended across these vital sectors.