Air Force Chief of Staff Gen. David Goldfein signs the 821st Security Forces Squadron’s Defender wall during his visit to Thule Air Base, Greenland, July 20, 2019. Thule AB was the last stop of a 10-day visit with allies and partners in Europe, including Estonia, Finland, United Kingdom, Germany and Greenland. (U.S. Air Force photo by Staff Sgt. Alexandra M. Longfellow)

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Photo by: Staff Sgt. Alexandra M. Longfellow |  VIRIN: 190720-F-IT949-1099.JPG