DoDMERB does not do the waivers. Calling them will not assist you. All DoDMERB does is Q or DQ and asks for remedials. Once the DQ comes down, the commissioning source, in this case HQ NROTC (medical board) will be determining if a waiver will be given. If he went through it 2 years ago and got a DQ, with no waiver, chances are it isn't going to change.
Caveat. Did he apply for the NROTC MO in HS? If he didn't than you may want to see via DoDMERB online portal if they have on his file NROTC MO requesting the exam. If so, than go back to my earlier statement regarding it is in HQs hands right now. It can take months, especially right now to get through the waiver process. They are handling everyones DQs that received in early winter/spring a scholarship.
One thing to remember is that exam is only valid for 2 years. For example, he took it August 1, 2013. Will not return to school until Aug 15th. That exam will not be valid for him to contract when he returns, and that means he has to take it again, Nothing will be paid until he has the Q or waiver.
~ If that is the case I would have your DS contact his unit and inform them that the exam will be not valid by the time contracting rolls around this fall. The unit may be able to initiate a new exam now so you don't get lost in the shuffle come fall.