Final answer:
TRICARE for Life provides secondary medical coverage to TRICARE beneficiaries with Medicare, covering expenses not fully paid by Medicare, such as co-payments and deductibles.
Step-by-step explanation:
TRICARE for Life (TFL) offers wrap-around medical coverage to TRICARE beneficiaries who have Medicare, which is the public healthcare system providing insurance primarily to people over sixty-five years old. TFL acts as a secondary payer to Medicare, covering eligible healthcare costs that Medicare does not fully cover, such as co-payments and deductibles. In essence, TFL helps fill the 'gaps' in Medicare coverage for those individuals who are eligible for both TRICARE and Medicare, ensuring a more comprehensive healthcare plan for eligible military veterans and their beneficiaries.