Is a USAR Soldier in the MED board process - Are they required to attend all drills, or is it optional?

I am trying to dig up specifics in literature about attending BTA while going thru the MEDBOARD, but so far nothing. I can say from experience that I once had a Soldier going thru a MEB/PEB and was still participating IDT. I'll keep digging and if I find anything specific, I'll let you know

I have extended twice now. Medboard takes forever. Go to drill ask about progress , do the best you can and leave, when the time comes with your head up.
Or don't show up and be remembered as that guy.
Enjoy your time with your unit, soon you will miss it

Man,t I'd say you have to follow your orders to the extent possible. Those in your chain of command know what's happening. In the meantime, your profiles will exempt you from certain duties. but not from showing up if possible. Once the Med Board process ends, things will change.