China's economy is expected to grow over the next 20 years at a rate that will make it larger than the U.S. economy. This suggests that China has the economic potential to be an U.S. military rival by the year 2020. But can it become such a rival? At present, China's military hardware is based on 1950s Soviet technology. To produce weaponry technologically comparable to U.S. weaponry by 2020, China would have to improve its technological capabilities...