1) If my memory serves me correctly, after two years on TDRL, I was reevaluated. They received my updated VA rating for PTSD for 70% as well as my request to change "not combat related" to "combat related". They found me still unfit while on TDRL, so they retired me---80% DoD with combat related PTSD. When I finally got that, then I applied to CRSC and was awarded it. I felt the "combat related" designation was key to being awarded CRSC. ***Come to think of it, I may have applied for CRSC when first put on TDRL and was denied, likely due to not having that combat related designation for PTSD. Side note: while looking through my final PEB decision, it said "Typically, the Board does not assign combat relation to the medical and mental health conditions incurred as the result of performing duties of Sensor Operator." But due in part to my unique circumstances that occurred downrange in addition to normal stateside SO duties, I was awarded it. Documentation was key---the picture was painted for them.
2) PTSD was awarded CRSC under "armed conflict" (AC). They denied my application for asthma (burn pit connection downrange), which I included in the CRSC application. Interestingly, they awarded me 10% CRSC for tinnitus even though I didn't even list it on the CRSC application . The origin code they used for the tinnitus award was "IN" or Instrumentality of War (even though it started right after a rocket attack explosion close-by).
Good luck. To my knowledge (and that's limited), I'm the only 1U that's received CRSC.