An integral part of health care provided to uniformed services dependents and retirees since 1981, the US Family Health Plan program is part of the Military Health System, offering the TRICARE Prime benefit in 16 states and the District of Columbia. The US Family Health Plan was the first and remains the only true population health/managed care model in the Military Health System. The six fully accredited, community-based health care systems, known as designated providers, include Brighton Marine Health Center, Christus Health, Johns Hopkins Health Care, Martin's Point Health Care, Pacific Medical Centers, and St. Vincent Catholic Medical Centers.