Your cost per person is probably off. National Guard is supposed to be supplemental, so they call up people from their normal life for higher pay. If keeping a standing army is cooking at home then calling up the National Guard is Uber Eats, not a big deal if occasional but not very sustainable.

And a ton of money is spent on the military, not even necessarily run of the mill corruption. Keeping those giant knock off Batmobiles running daily probably requires special servicing and parts, procurement and logistics have specific markups, long term lodging and food were unplanned and thus expensive, etc…