Christians joining the military?

Its not a soldiers fault he is brainwashed by his country and his religion. Man has fought numerous battles over religion and revenge. Its easy to brainwash people into fighting for a worthless cause. All you need is an emotional traumatic event to spark the ignition and walla you have yourself a patriotic ignorant soldier sacrificing his life so that some multi millionaires and billionaires can laugh it up at their secret meetings