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Senior Airman Zachary Castillo, 721st Security Forces Squadron Defender, stands at his post inside Cheyenne Mountain Air Force Station, Colo., Sept. 2, 2014. The 721st SFS provides security for personnel and resources at the subterranean base known as America’s Fortress. (U.S. Air Force photo by Airman 1st Class Krystal Ardrey)
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