None of that applies to people who join an go into a combat arm like the infantry, one where you are definitely going to be shooting at people and where they are going to shoot at you personally if there is a war. It is eminently possible to get all 5 of your reasons without going into a real combat arm. And even if you go into one in peacetime for the macho factor and change your mind when a war comes, getting out of it is easy. So any of those who go to the sharp end voluntarily, at least now, are doing for something other than the GI bill and health care.
So it seems to me that since the purpose of the military is to fight and win, the motivations of people who do that most directly are most important.
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