TriCare for Life is what they put you on when you turn 65. Mr Lacey was switched when he turned 65. Basically Medicare is your primary and Tricare is the secondary. He was kicked out of the local Army hospital and had to find a doctor in town (easier said than done) but so far (and he’s healthy) it’s worked out okay.
We were able to see a specialist at a military hospital with tricare for life, with some persistence, in a special case where it seemed like they were the best option