Colin Powell was an American warrior, a trailblazer, one of our finest military leaders — a shining example of what we talk about when we talk about the American dream. Some will remember him as the man who closed the sale for the Iraq war. To me, he will always be the man we should have listened to about when and how to go to war. I can think of more than 7,000 reasons why Powell’s doctrine has enduring value — perhaps now more than ever.