What should the US military be like?

There is a lot to criticize about the United States military. (For example, the military industrial complex; the strict, often abusive hierarchy, the rules of engagement that has lead to thousands of civilian deaths, the prevalence of rape, the fact that each of the three branches gets exactly ⅓ of funding despite vastly different applicability to modern warfare, etc.) Some people don’t think the military should exist at all, at least not in anything close to its current state.

On the other hand, you can argue (and I’d agree) that there is some role for the US military in the world. (For example, disaster relief strikes me as a benign use of military forces.)

What should the US military look like? How big should it be, how much should we spend, and what should be its role in the world?