TEHRAN, Iran (AP) - Iran's defense minister expressed his government's disquiet about the U.S. troop presence in neighboring Iraq and Afghanistan, and hinted that some Iranian generals believe they should strike first if they sense an imminent U.S. threat. In an interview with pan-Arab satellite channel Al-Jazeera, Ali Shamkhani was asked how Iran would respond if America were to attack its nuclear facilities. "We will not sit to wait for what others will do to us," he said. "There are differences of opinion among military commanders (in Iran). Some commanders believe preventive operations is not a model created by Americans...