For roughly four months every year, Thule Air Base, Greenland experiences no sunlight. The base, noted for being the most northern United States military installation in the world, is home to Air Force Space Command Airmen. Here, the sunlight meets the barrier of night. ( Air Force photo by Tech. Sgt. David Salanitri)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
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Keywords: afspc, air, crisswell, force, grant, greenland, pepper, radar, raymond, space, thule