"Best in the world" isn't a measure of absolute capability or competence, it's a measure of relative capability and competence. What military would anyone say is better, and on what basis?

Certainly there's room for improvement, as there always is, but I'm not sure we should be pursuing improvement in pop-centric COIN or state-building, tasks that are likely to degrade competence at core military functions. If we really want to run about building states - and I can't see why we should - it's time to develop a specific non-military state building capacity, in which the military's only functions would be providing security and training corresponding military forces.