Going down to (relative) German level of military spending would free up around $350b (per year). That could go a long way towards improving various social programs. The other issue is that health care in the US seems ridiculously expensive (with doctors making 20x minimum wage and various insurance companies profiteering from a broken system), so in the end this money would buy less health care than in Germany. The same is true with higher education - it's free in most of Europe, but the conditions aren't nearly as lavish as in the US (so again, the money wouldn't improve the situation as much as it could).