The U.S. military dominates the globe, but increasingly faces an enemy it cannot see. In the third in a series on U.S. power, Peter Goodspeed chronicles efforts to build a secret army for the covert war on terrorism. - - - The United States is building an elite, secret army to carry the war against terrorism into the world's darkest corners with a new wave of covert pre-emptive operations. For the first time since the Vietnam War, U.S. defence officials are undertaking a massive mobilization of their elite special operations command, pouring billions of dollars in new funding into high-tech...