You could completely eliminate US defense spending and you would only be able provide every individual with roughly $3000 annually.

Also, your comparison to other countries is confounded by the fact that Western countries (i.e. Europe) maintain a low level of defense spending because they have an explicit guarantee of defense under the North Atlantic treaty and a promise of being covered by the US’s nuclear umbrella. If the US were to cut defense spending, other Western countries would need to substantially increase their own.