In my opinion as GITS is a little confusing, if you try to think it from Major's perspective. Why is she what she is

As a matter of fact none of the series later or the original movies tried to be clear on that issue

It seems live action might have something about that

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Watch everything but only take the good things from it

Ask, think and learn. Because the more we know the more we grow.

Watching the wrong to happen is the same as commiting the wrong.

If it looks like things are forcing you to be creative, Then be creative.

its a uniquely Miyazaki film, one only he could make and its uniqueness places it beyond being easily critiqued.[About Porco Rosso]
taken from a quote of Saddletank and Orphic Okapi

You probably should limit yourself to the original comics for canon material. The films and TV series appeared to conflict with each other and in the TV series the major's military past got some screentime but I don't have a clue as to whether this is canon or not.

Her unexplained background I think adds to the strength and opacity of the character; explaining everything would be a little anticlimactic as well as take away for of the mystery.

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Isakaya High School Roleplaying Info

"An old man like me stands no chance fighting against a high school girl in her underwear" - Oshino Meme, Nekomonogatari (Kuro)

FYI GITS is getting another release because of this: https://twitter.com/ngsm/status/850251922019721217

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It's now very common to hear people say, 'I'm rather offended by that.' As if that gives them certain rights. It's actually nothing more... than a whine. 'I find that offensive.' It has no meaning; it has no purpose; it has no reason to be respected as a phrase. 'I am offended by that.' Well, so loving what - Stephen Fry.