What was your vehicle hit by? Another vehicle? I'm sorry, I don't recognize MSR. Were you outside the wire when it happened? Here is the definition in DODI 1332.38 for combat related:
a. As a direct result of armed conflict,
b. While engaged in hazardous service,
c. In the performance of duty under conditions simulating war, or
d. Through an instrumentality of war.
and more specifically, this paragraph would be of interest to you I think:
E3.P5.2.2.4. Caused by an instrumentality of war. Incurrence during a period of war is
not required. A favorable determination is made if the disability was incurred during any period
of service as a result of such diverse causes as wounds caused by a military weapon,
accidents
involving a military combat vehicle, injury, or sickness caused by fumes, gases, or explosion of
military ordnance, vehicles, or material. However, there must be a direct causal relationship
between the instrumentality of war and the disability. For example, an injury resulting from a
Service member falling on the deck of a ship while participating in a sports activity would not
normally be considered an injury caused by an instrumentality of war (the ship) since the sports
activity and not the ship caused the fall. The exception occurs if the operation of the ship caused
the fall.
As you can see, there is no exception stated for US Soldier. Would it not be combat related if it had been an accidental friendly fire situation? How is it any different? That would be my argument.
Link to the DODI 1332.38:
http://www.dtic.mil/whs/directives/corres/pdf/133238p.pdf
And as for the neck, I would at least make sure that the VA is rating on this. If they rated everything right in the first place, then there shouldn't be any change to your other ratings. You were boarded on the cervical neurostimulator? If you were, then the neck should be seen as a secondary condition of whatever condition caused you to need the neurostimulator and the rating for your neck should be a part of the overall rating for your condition. If you were already found unfit for that condition, then the VA re-rating should (hopefully, unless I am wrong) take care of raising your DoD percentage. Anyone with more knowledge than I can feel free to chime in on this!
Hope this helps and good luck on your appeal! Keep fighting for what's right!
Trevis