The more people in an army, the more human losses and the more armed the more wars will be on the planet. Ideally there would be no army at all and live in harmony all but unfortunately that is not human nature. If you have grown up in a country then you will learn the history and tradition there and you will have the impression that your country is the best and worth fighting for it but that is exactly what happens to the people in other country with who will fight against.