Four CAF Pillars found at mountaintop
Airmen reach the summit of Granite Peak in Montana after a climb of more than 7,000 feet Aug. 30. They completed this task after three days as part of the U.S. Air Force 50 Summit Challenge, a group that was established in May, 2013. (Courtesy photo)

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Photo by: Courtsey  |  VIRIN: 160807-F-ZZ999-0003.JPG