Armies are created to protect an established system, not people. In the future, an educated humanity will not stand for war.
Social change cannot come above the intellect, it comes about by people suffering. And the more people are related to that, the more they lose respect for an existing government. They will seek another direction. If there are too many people who seek a new direction, then the existing government calls upon the army and police to manage society – that is called fascism.
As long as there are prisons, police, armies, navies; we are not civilized. When the Earth joins together and uses the Earth intelligently, that will be the beginning of civilization.