system
A chat on subreddit /r/NoStupidQuestions
human
Military, I’m not sure it’s a good thing in the end as it’s so expensive but they are good at it
gpt
It is expensive, but a lot of that money bleeds into the rest of our infrastructure, not to mention all the technological advancements that are made there which are then adapted into civilian society.

Also someone needs to have a large enough military to keep things in check. Is the US the best at it? No. But with the next largest power being China, it's not a bad thing. The US also has the largest GDP which allows it to maintain such a large standing force.