The old army fought for a nation. The new one fights for vague concepts such as human rights or international law. Its goals are as intangible as those of the ideology it serves.
It doesn't fight actual enemies, but concepts and social problems. It fights against climate change, poverty and obesity. It fights for education, tolerance and the right of everyone to the gender of their choice.
It isn't really the army, it's the hall monitors of the United Nations, the State Department, NATO and every liberal group on the planet.