It helps to understand how difficult that task really is.
It might be necessary to start over. Security forces that are distrusted and feared by the population can be worse than no security at all.
All institutions must rise together. It is dangerous to raise a capable army that the Finance Ministry cannot pay. This is a coup d'état in the waiting.
I hope what they did in Liberia will work in the long run. I hope something like it can be implemented and successful in Afganistan, so we can bring our people home without the whole region imploding.
And if this does work? Well, maybe then we can get some of our international organizations to replicate the success in other troubled spots around the globe, before invasion or widespread famine comes to pass.