As the United States quietly pulls its most precious military assets away from the coasts of Asia, they are falling back to places like Guam in Micronesia, a US island territory far beyond the reach of most conventional missiles.It sounds like a retreat but for the Chinese military it is actually a much trickier problem. In modern warfare, distance can become a shield and dispersion a weapon.This is the puzzle a team of Chinese defence scientists has been solving. Their answer, published...