How do you measure that it works? Is there another Armed Forces without the screaming but with a comparable budget that we regularly engage in war games with and regularly win against?

I think "it works" is often indistinguishable from "we've always done it that way," especially for organizations like the US military that have the budget and entrenched status that it's hard to imagine the organization suddenly not working. Maybe the thing you're doing is irrelevant and you might as well stop. Maybe you'd do better if you stopped. But you have no way of knowing.