Despite the rapid advance of Army and Marine forces across Iraq over the past week, some senior U.S. military officers are now convinced that the war is likely to last months and will require considerably more combat power than is now on hand there and in Kuwait, senior defense officials said yesterday. The combination of wretched weather, long and insecure supply lines, and an enemy that has refused to be supine in the face of American military might has led to a broad reassessment by some top generals of U.S. military expectations and timelines. Some of them see even the...