On January 4, 2010, about ten thousand PLA soldiers and one hundred military officials from the Tibetan military region armed with one thousand armored vehicles had a combat drill on the Qinghai-Tibet plateau in minus 20 degrees centigrade weather. The purpose was to strengthen the PLA’s capability to respond to emergencies in severe cold conditions, reported the PLA Daily on January 10, 2010.
Source: PLA Daily, January 10, 2010
http://www.chinamil.com.cn/jfjbmap/content/2010-01/10/content_17734.htm