Let me begin by asking you two questions.
ONE - Directly in front of you is a button. Pushing it will launch a large nuclear weapon that will directly hit in the center of a city of over one million people. Can you push that button?
Without hesitation, second-thoughts, or any reservations, can you push it?
And that's not some hypothetical, one of my best buds from HS wound up going through the Air Force Academy and was a commander of a Titan II missile launch facility. And I know he would have pushed that button.
TWO - In front of you is some, hell, kid - 18 or 19 years old, tops. Can you walk up behind them, pull out your K-Bar knife and slice their throat from ear to ear?
Yeah, I know that's not what everyone in the military does, most are just clerks and supply people. But their entire existence is only to support those two above listed activities and all that comes in-between.
But, the alpha/omega of the military is to kill people who are either a) in the way, or b) not doing what you want, or c) a threat. Everything is geared to that end.
I think the problems that many people have with the military, and a lot of people in here sure would, is that you conform to military culture, it will not budge a fraction of an inch for you. Lot's of people have trouble with that. Lot's of people also have trouble with the military organization deal. Rank is rank, and anyone of a higher rank, no matter how dumb they are, can order you about, and your only response is "Sir, yes sir!"