Missile-launchers fire at targets during a joint drill of the army and air force in China's western plateau region in Chengdu, Southwest China's Sichuan province, photo released on Oct 21, 2011. This is the first time the Chinese military held a drill using live ammunition at a height of 4,500 meters above sea level. [Photo/Xinhua]

Army infantrymen shoot at targets during a joint drill of the army and air force in China's western plateau region in Chengdu, Southwest China's Sichuan province, photo released on Oct 21, 2011. [Photo/Xinhua]