It was supposed to be over, America's war in Iraq. So all the old emotions boiled up anew as Americans absorbed the news that U.S. bombs were again striking targets in the nation where the United States led an invasion in 2003, lost almost 4,500 troops in the fight to stabilize and liberate it and then left nearly three years ago. In interviews across the country, from the 9/11 memorial in New York to the Iowa State Fair and an Arizona war monument, Americans voiced conflicted feelings as airstrikes began Friday, ordered by President Barack Obama who had fulfilled a campaign promise when he withdrew the last U.S. forces from Iraq in 2011.