What are the requirements and impact of modern warfare on military space technology?

In the traditional sense of the three armed forces, in fact, developed countries are now stepping up the formation of the fourth military - the army of the sky, this military and military space technology has a great deal to do with the future of high-tech war is obviously more and more reliant on communications and satellite systems, the army of the sky can be directly involved in the attack on spacecraft in outer space, so as to master the right to control the sky. Thus mastering the right to control the sky.