Thule Air Base or Thule Air Base/Pituffik Airport , is the United States Air Force

United States Air Force

The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

's northernmost base, located 1118 km (694.7 mi) north of the Arctic Circle

Arctic Circle

The Arctic Circle is one of the five major circles of latitude that mark maps of the Earth. For Epoch 2011, it is the parallel of latitude that runs north of the Equator....

 and 1524 km (947 mi) from the North Pole

North Pole

The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is, subject to the caveats explained below, defined as the point in the northern hemisphere where the Earth's axis of rotation meets its surface...

 on the northwest side of the island of Greenland

Greenland

Greenland is an autonomous country within the Kingdom of Denmark, located between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for...

. It is approximately 885 km (549.9 mi) east of the North Magnetic Pole

North Magnetic Pole

The Earth's North Magnetic Pole is the point on the surface of the Northern Hemisphere at which the Earth's magnetic field points vertically downwards . Though geographically in the north, it is, by the direction of the magnetic field lines, physically the south pole of the Earth's magnetic field...

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Thule Air Base is the U.S. Armed Forces' northernmost installation, located 750 miles north of the Arctic Circle. Thule's arctic environment offers some of the most spectacular scenery found anywhere in the world, including majestic icebergs in the North Star Bay, the massive polar ice cap and Wolstenholme Fjord—the only place on earth where three active glaciers join together.

Thule Air Base is home to the 21st Space Wing's global network of sensors providing missile warning, space surveillance and space control to North American Aerospace Defense Command and Air Force Space Command.

Thule Air Base is also home to the 821st Air Base Group and is responsible for air base support within the Thule Defense Area for the multinational population of "Team Thule." The base hosts the 12th Space Warning Squadron who operates a Ballistic Missile Early Warning System designed to detect and track ICBMs launched against North America.