TRICARE is the health care program for almost 9.6 million beneficiaries worldwide—including active duty service members, National Guard and Reserve members, retirees, their families, survivors, certain former spouses and others registered in the Defense Enrollment Eligibility Reporting System (DEERS).
To learn more about TRICARE: 
TRICARE Benefits
Health Plan Options
TRICARE has changed.
Over the coming months and years, you will see some significant changes to the TRICARE health plan. Most provisions went into effect on January 1, 2018, with full implementation occurring on January 1, 2019. Go to the TRICARE Changes and You Spotlight to learn more.