Source: South China Morning PostThe Chinese air force has put an upgraded version of one of its most advanced air-defence missile systems to an extreme test in unfamiliar terrain, according to state media.Observers said the exercise involving the upgraded HQ-9 system was meant to show the hardware at full stretch, as the military presses on with plans to develop a modern combat-ready force.“[We] want to learn how to protect and maintain the new weapon system under rugged surroundings, as well as to better camouflage it and ……Read More