If someone abhors something, will they use it?
If the INFJ abhors violence, will the INFJ use it?
The INFJ abhors violence, therefore they will not use it.
A soldier is not a job that an INFJ will embrace. This often includes the use of violence, or at least the training of learning to use violence. This would upset INFJ sensibilities.
Sorry, these sorts of statements/views of mbti are just silly.
You're picking up a nice little INFJ Keirsey/mbti stereotypical description and planting it on someone. The descriptions are just descriptions - they're archetypes, almost cartoons in some ways. People can deviate quite a lot from the stereotypes, particularly when you factor in life experiences as well as *personal values*/driving motivations and passions in life.
There's nothing about having a cognitive function set of NiFeTiSe that means they're incapable of being in the army, or finding it meaningful (it sounds like the OP has a very strong drive/'mission' and sees the army as a way to actualize some of these values/beliefs). Given larger goals / visions, and a belief that what one is doing is helping the larger picture and grander cause, all of the 'details' of violence may not offend the sensibilities of some INFJ's. I mean, there are a great number of F's - probably more than T's - who are the ones who are going to harden themselves to short-term losses because they're focused on what they see as a greater good (i.e. suicide bombers, leaders who actually commit atrocities on their people, anarchists, whatever. And btw, I'm by no means comparing the OP to these sorts, I'm just trying to point out that the INFJ's/ 'F's' abhor violence thing is kind of a dumb argument).
In any event - OP, if you're really driven to do this, you already have a pretty key ingredient in making it happen and finding it purposeful: the very fact that you're driven and passionate about it. I wouldn't worry about whether or not it fits what the descriptions say you're 'supposed' to be doing - in the end, it's what you think you want out of life and what will give you purpose/meaning/fulfillment. Is it a traditional INFJ career/role? Probably not. I myself wouldn't have the value set or ability/desire to do it . But that doesn't mean it's beyond something an INFJ could do. If you're going into it with open eyes, aware of the realities as well as difficulties given your personality and such, then you're off to a decent start. You may learn, if you do it, that it in fact is not what you thought and that you really can't stomach it; or, maybe it'll be your calling. Anyway... research, soul-search, and good luck!
PS - and by the way, I'm a Business Analyst/systems tester (although I have never really nailed down career, but this is how I'm making a living right now), one of my INFJ friends is an electrical engineer, another one does environmental ed at a zoo, and another is a Systems Analyst/has done misc jobs his entire life. None of us are counselors, in other words.