A visitor to the China Aviation Museum located on the outskirts of Beijing, takes a photograph of a row of old anti-aircraft guns on display August 17, 2010. China is expanding its military edge over Taiwan, increasing the lethality of its short-range ballistic missiles while raising the risk of "misunderstanding and miscalculation," the Pentagon said on Monday, just a day after a leading armed forces newspaper said that China's military thinking is outmoded and they should learn from others, especially the United States, when it comes to modernising its vast armed forces. REUTERS/David Gray (CHINA - Tags: MILITARY POLITICS IMAGES OF THE DAY)