30% is just a disability % assigned by the PEB. When you are rated 30%-100% by the PEB you are medically retired. If placed on TDRL and rated 30-50% by PEB you receive 50% of your base pay(36 month average) during TDRL assignment. Between 50-75% you receive that percentage of base pay. Anything over 75% is capped at 75%. If placed on PDRL you receive the % assigned of your base pay.