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Activating a secured room at ft. greely. so we can show you generally how the interceptors work. >> as the alarms go off, what you would see is the while shells behind us would separate quickly and immediately you would see a flash of game as the gbi leaves the tube at an incredible speed. >> reporter: if it works, the interceptor kills the incoming nuclear weapon. >> we train to shoot a bullet at the bullet and destroy it so that it doesn't destroy us. >> reporter: have the drills this year taken on a new meaning? >> what that does is make it more real. i now have a leader of the foreign coun...

This miniaturized nuclear warhead. this is one of the key aspects that they were trying to accomplish was to get a nuclear warhead small enough and light enough but powerful enough to put on an intercontinental ballistic missile to strike the u.s. something kim jong-un said he is doing this year and he is now saying he accomplished it. major milestone in terms of north korea. major provocation for the region that nuclear test that followed one after another today was massive. as somebody iting sitting here seoul to have a explosion of that magnitude and such a huge increase in payload compared...

The system would work. >> i have 100% confidence the system would work. >> reporter: despite a 60% success rate. it has only struck its -- >> just because we've had some failures doesn't mean we're not learning. >> alaska senator dan sullivan believes the interceptors are still america's best shot as a last defense, as north korea rapidly moves closer to being ability to strike the u.s. mainland, introducing a bill boosting the missiles to a total of 72, so far a cost of $40 billion to taxpayers. >> doing nothing in the face of this threat, when we clearly have the capability to make sure we h...