I'm against war, but I'm also smart enough to know that by just talking you won't stop the hate and aggression. You have 2 groups of people in that sense: the aggressive and the non-aggressive type. As much as the non-aggressive want to stop war by negotation, you'll always have to deal with the aggressives, on both teams.
So yes, you make a valid point in that sense.
Anyways, on to your choice of joining the army. I seriously recommend you not to, because it's people like you that are a danger when in the army. I'm not bashing you as a person, it's just your boredom of life and everything makes it likely that you don't give a f**k about life, and thus also not about someone elses. Especially when you're brainwashed by the army and makes you believe taht the people in the villages are evil people that want to destroy America, even though they are in fact tools themselves.
So no, I wouldnt want you in the army. That's the most important thing.
What would I recommend you? Buy a ticket off the continent and travel for a few months or maybe a year even. Just enjoy the grandness of the planet, enjoy the people that live there, the cultures, it's so much more than what you know. You're in your little world and you do not enjoy it, so instead of joing an army that makes you feel even worse, live your life to the fullest. Nows your chance!!!
By travelling on your own, you face yourself, meet people that you would have never known to meet, and you will become a much stronger person.
My travel last year made me so much stronger. It's still affecting me now, and I'm still growing progressively as a person, so much more than I did.
So yeah, stop the army thoughts and instead take a real risk. Go on an adventure.