The U.S. military tests its land-based Aegis missile defense system in 2018. Such systems can track and intercept short and medium-ranged missiles but struggle against larger, more powerful intercontinental ballistic missiles of the sort used by Russia and China. Mark Wright/AP/Missile Defense Agency
Mark Wright/AP/Missile Defense Agency
President Trump has told the Pentagon to take another look at missile defense. Technology to shoot down missiles has existed for decades, but the kind of missile shield Trump is looking to build would be much more complex — and expensive.
A key part of the new missile defense system, which Trump described