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Pituffik Space Base, United States Department of Defense-operated military facility located in the northwest of Greenland. The base was established in 1951 under a defense agreement signed between Denmark and the United States. Operated by the 821st Space Base Group, it is the United States’ northernmost military installation. Approximately 650 personnel are stationed at the base, around 200 of whom are members of the United States Air Force and Space Force.US Army Corps of Engineers, ''People: