 Yeah, there's no doubt in my mind that had Greene lived, and he was 43 when he died in 1786, so he actually died before the Constitutional Convention, there's no doubt that he would have been Secretary of War. And Henry Knox was a perfectly good Secretary of War for George Washington and was a logical choice too. I'm not denigrating him, but I think most historians of this period would say that Greene would have been the country's first Secretary of War, or as we call them today, Secretary of Defense.