The Thule Air Base is a military base in Greenland belonging to the US. It is, in fact, the US’s northernmost military base in the world, located just 1,524km from the North Pole and 1,207km north of the Arctic Circle.
The US established the Thule Air Base in 1941 to help Denmark defend its colonies from increasing German aggression. Today, the military base in Greenland is used by the US Air Force (USAF) Space Command and the North American Aerospace Defense Command. Specifically, it is home to the 21stSpace Wing’s network of sensors that provides early missile warning, space surveillance and control.