These stats are easy to find. The US spends a much higher percentage of its GDP on health care (16.6%) than anyone else. The difference is bigger than the entire US military budget. If the US cut its health care spending to the level of France (12.1%) or Germany (12.7%), it could more than double its military spending.
It terms of actual resources, the difference is even bigger, as US-Americans work much more than Europeans. I’m not sure what for.
ETA: At the same time, the US has a younger population, which should not really need as much care.