Pituffik Space Base, formerly Thule Air Base, is a United States Space Force base located on the northwest coast of Greenland. It is the northernmost installation of the U.S. Armed Forces, 1,210 km (750 mi) north of the Arctic Circle and 1,524 km (947 mi) from the North Pole. Pituffik's Arctic environment includes icebergs in North Star Bay, two islands, a polar ice sheet, and Wolstenholme Fjord. 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 (NORAD), the United States Space Force, and joint partners.