Chief Master Sgt. Brendan Criswell, Air Force Space Command command chief speaks's to Airmen stationed at Thule Air Base, Greenland Dec 11, 2017. The base is the most northern located base in the United States military, and is charged with the mission of missile warning, space surveillance and satellite command and control. ( Air Force photo by Senior Airman Dennis Hoffman)

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