I keep hearing the Mac II is not canon. I'd like to know why but first I'll state my position:
I don't accept SK's non-involvement as justification for it's non-canon status.
Dislike of characters plot etc. also doesn't disqualify it.
The model number of Valkyries doesn't do it for me either. F-101s served in the air force long before F-16s.
What exactly about Mac-II makes it "impossible" for the story to be part of the canon along with Mac+ and Mac7?