Peering across a dense stretch of woodland outside of Denmark's capital with camouflage paint smeared across her face, 20-year-old Katrine scans the horizon for approaching threats.

Get the latest news headlines and top stories from NBCNews.com. Find videos and news articles on the latest stories in the US.

Latest Chicago and local news from Chicago Tribune. Find top news stories from Chicago suburbs, downtown, neighborhoods and more ...

The latest news and headlines from Yahoo News. Get breaking news stories and in-depth coverage with videos and photos.