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Military

Several American and Danish military bases are located in Greenland, including Pituffik Space Base (previously Thule Air Base), which is home to the United States Space Force 's global network of sensors providing missile warning, space surveillance and space control to North American Aerospace Defense Command (NORAD). Elements of the sensor systems are commanded and controlled variously by Space Deltas 2, 4, and 6.

In 1995, a political scandal in Denmark occurred after a report revealed the government had given tacit permission for nuclear weapons to be located in Greenland, in contravention of Denmark's 1957 nuclear-free zone policy. The United States built a secret nuclear powered base, called Camp Century, in the Greenland ice sheet. On 21 January 1968, a B-52G, with four nuclear bombs aboard as part of Operation Chrome Dome, crashed on the ice of the North Star Bay while attempting an emergency landing at Thule Air Base. The resulting fire caused extensive radioactive contamination. One of the H-bombs remains lost.