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]

Army tanks return after a joint drill in China`s western plateau region in Chengdu, Southwest China`s Sichuan province, photo released on Oct 21, 2011. [Photo/Xinhua]

A fighter jet conducts an air-raid 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]

A soldier in the People`s Liberation Army shoots an anti-aircraft missile 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]