I guess you can read into both sides however you want. I agree with you that you don't have to serve in the military to know about the constitution, but there are 2 types of defending the constitution. Both are equally important, but for now, only one involves possibly laying down your life for it.
I made the comparison in my post for lack of knowledge purposes. I don't think anyone should assume they know how things operate if they haven't done it. If you'll notice Justme stepped back from initially calling for all of the soldiers to be punished to a lesser appeal.
All in all though I think we are arguing semantics.