Navy Admiral Mike Mullen, the next chairman of the Joint Chiefs of Staff, is troubled by the Iraq war, the Associated Press reported. He thinks it has become such a consuming focus of U.S. attention that it may be overstretching the military and distracting the nation from other threats. When he steps into his new office in Room 2E676 at the Pentagon on Monday, replacing Marine Gen. Peter Pace as the senior military adviser to the president and the defense secretary, Mullen already will be on record expressing his war worries with an unusual degree of candor. "I understand the frustration over the war. I share it," he told his Senate confirmation hearing. As evidence of his focus on Iraq, Mullen has told Congress he intends to travel to Baghdad immediately after he takes over so he can see firsthand how the war effort is going. Mullen, 60, was Defense Secretary Robert Gates' choice to replace Pace, who had been vice chairman of the Joint Chiefs when the Iraq invasion was launched in 2003.