Santa Claus may see you when you're sleeping, but NORAD makes sure it sees Santa pretty much round-the-clock. The North American Aerospace Defense Command not only follows Saint Nick's sleigh ride with its famous NORAD Tracks Santa site, but it is also involved in a struggle over resources, border control and broader military presence right in Santa's vast and magnificent home: the Arctic.

In April, U.S. President Barack Obama signed a new command plan that gives NORAD and the U.S. Northern Command greater responsibility in protecting the North Pole and U.S. Arctic territory.

The Arctic region — covering more than 30 million square kilometers and stretching around the territorial borders of Canada, Denmark (via Greenland), Norway, Russia and the United States by way of the Alaskan coastline — is transforming before our eyes. And not just because the ice is melting. It's increasingly the site of military posturing, and the U.S. isn't keeping up with the rest of the world.