Thule Air Base

Thule Air Base, or Thule Air Base/Pituffik Airport, is the United States Space Force's northernmost base, and the northernmost installation of the U.S. Armed Forces, located 750 mi north of the Arctic Circle and 947 mi from the North Pole on the northwest coast of the island of Greenland. Thule's arctic environment includes icebergs in North Star Bay, two islands, a polar ice sheet, and Wolstenholme Fjord – the only place on Earth where four active glaciers join together. The base is home to a substantial portion of the global network of missile warning sensors of Space Delta 4, and space surveillance and space control sensors of Space Delta 2, providing space awareness and advanced missile detection capabilities to North American Aerospace Defense Command, the United States Space Force, and joint partners.

Source: Wikipedia