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Cheyenne Mountain Hosts 5K Tunnel Run and Open House
A runner has a close encounter during the Cheyenne Mountain Air Force Station 5k Tunnel Run/Open House at Cheyenne Mountain Air Force Station, Colo., on May 26, 2016. With the nickname "America's Fortress," CMAFS is situated beneath 2,000 feet of granite and consists of 15 buildings resting on more than 1,300 large steel springs. (U.S. Air Force photo by Staff Sgt. Amber Grimm)

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Photo by: Staff Sgt. Amber Grimm |  VIRIN: 160526-F-CV567-042.JPG

Peterson SFB Schriever SFBCheyenne Mountain SFSThule AB New Boston SFS Kaena Point SFS Maui