For the first time ever, the Pentagon will try to shoot down an intercontinental-range missile Tuesday. The move is partly a response to North Korea, which has test-launched three missiles in the past three weeks. Its official news agency said Tuesday morning that dictator Kim Jong Un threatened, “to send a bigger gift package,” to the U.S.  A new Russian military base in the Arctic is also putting attention on the Pentagon’s northernmost base, located in Greenland, which was

originally built as a buffer during the Cold War.  Thule Air Base, 750 miles into the Arctic Circle, is not easy to reach or maintain. But the U.S. did just complete a significant upgrade for space and missile defense there, one of several early-warning systems getting upgraded worldwide, reports CBS News’ Jeff Glor who recently returned from a special tour of Thule. READ MORE