Final answer:
The DoD has established a three-tier uniform formulary for prescription drugs reimbursed by TRICARE, with each tier indicating a different level of co-payment for the medications.
Step-by-step explanation:
The Department of Defense (DoD) has established a three-tier uniform formulary for prescription drugs that may be reimbursed by TRICARE. This formulary categorizes medications into three tiers based on medical effectiveness, safety, and cost. Tier 1 includes generic medications with the lowest co-payment, Tier 2 includes brand-name medications with a higher co-payment, and Tier 3 includes non-preferred medications with the highest co-payment.