National Security: The administration moves an advanced missile defense system to Guam because it knows a single low-yield nuke detonated at high altitude could send America back in time a hundred years. The announcement Wednesday by the Defense Department that it would soon deploy the Terminal High Altitude Area Defense System (THAAD), a missile defense system inherited from the Bush administration, to Guam underscores the seriousness of the threat from North Korea, whose actions, Defense Secretary Chuck Hagel rightly said, "present a real and clear danger." This move comes after the Obama administration reversed its previous scuttling of Bush administration...