Washington Post columnist George Will wrote last week that U.S. troops should soon depart both Afghanistan and Iraq because their work is done and it is up to the government and military in both countries to take over the work of nation building and securing their citizens. Is he right? Where does this leave the expected request from the top U.S. general in Afghanistan for more U.S. troops to combat the Taliban there? Do U.S. troops leave even if the situation deteriorates? What lessons do these two wars offer for future U.S. intervention?