Which of the following best describes the enrollment method for TRICARE Retired Reserve (TRR)?

The enrollment method for TRICARE Retired Reserve (TRR) is best described as premium-based enrollment after retirement. This option highlights that individuals who retire from the Reserve component and are eligible for TRR must actively enroll in the program and pay premiums to receive health care coverage. It emphasizes the need for individuals to take initiative for their health care after completing their service, as TRR is designed for retired reservists who may not have access to other TRICARE plans.

Automatic enrollment is not applicable here, as individuals need to opt-in and cannot be enrolled automatically simply based on their retirement status. Ongoing military service does not pertain to TRR enrollment since it specifically targets retired reservists, and spousal enrollment alone does not encompass the entirety of the program's eligibility or enrollment process, which applies to retirees themselves.