A lifetime in the military gives me a little different point of view....
Let me re-hash it a bit:
MOA is just a subdivision of mils, just like mils is a subdivision of degrees....
The whole thing is based on 6.283 radians or 21,600 minutes in 360 degs.... So 1 deg = 17.777 mils = 3.483 MOA
NATO and the US Military uses 6400 mils per 360 deg (just rounded up a bit).
The old Soviet system used 6000 mils, and the Swedish use to use 6300 mils, but I think they changed.
You can choose which way you want to figure distance but if you are using a mil dot scope with moa adj then???