brettsmama:I'm assuming you mean ETS, as in getting out. I believe you still get tricare 90 days out. DH also said you may be able to extend coverage by paying the full premium. Check with your local tricare rep, they should be able to answer all your questions.
It may vary by branch or maybe there is more than one to mean the same thing, but she used the correct acronym.
I don't have personal experince with your question since my husband was medically retired, but if your near a base you should be able to get information from the tri-care office, there or simply call (sometimes I have to call more than once though, it seems not everyone who answers really knows what they are talking about)