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https://www.nytimes.com/aponline/2017/05/26/us/politics/ap-us-missile-interception.html

WASHINGTON — Preparing for North Korea's growing threat, the Pentagon will try to shoot down an intercontinental-range missile for the first time in a test next week. The goal is to more closely simulate a North Korean ICBM aimed at the U.S. homeland, officials said Friday

The American interceptor has a spotty track record, succeeding in nine of 17 attempts against missiles of less-then-intercontinental range since 1999. The most recent test, in June 2014, was a success, but that followed three straight failures. The system has evolved from the multibillion-dollar effort triggered by President Ronald Reagan's 1983 push for a "Star Wars" solution to ballistic missile threats during the Cold War — when the Soviet Union was the only major worry.

North Korea is now the focus of U.S. efforts because its leader, Kim Jong Un, has vowed to field a nuclear-armed missile capable of reaching American territory. He has yet to test an intercontinental ballistic missile, or ICBM, but Pentagon officials believe he is speeding in that direction.

Marine Lt. Gen. Vincent Stewart, director of the Defense Intelligence Agency, said this week that "left unchecked," Kim will eventually succeed.

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The Pentagon has a variety of missile defense systems, but the one designed with a potential North Korean ICBM in mind is perhaps the most technologically challenging. Critics say it also is the least reliable.

The basic defensive idea is to fire a rocket into space upon warning of a hostile missile launch. The rocket releases a 5-foot-long device called a "kill vehicle" that uses internal guidance systems to steer into the path of the oncoming missile's warhead, destroying it by force of impact. Officially known as the Ground-based Midcourse Defense system, the Pentagon likens it to hitting a bullet with a bullet.

http://www.reuters.com/article/us-usa-missiles-test-idUSKBN18M2C9

"These tests are scripted for success, and what's been astonishing to me is that so many of them have failed," Coyle said.

The interceptor system has been in place since 2004, but it has never been used in combat or fully tested. There currently are 32 interceptors in silos at Fort Greely in Alaska and four at Vandenberg, north of Los Angeles. The Pentagon says it will have eight more, for a total of 44, by the end of this year.

NK tests missile failures, US responds with testing missile defense failures. Good back and forth.