Cheyenne Mountain Hosts 5K Tunnel Run and Open House

Runners take off from the starting line at the Cheyenne Mountain Air Force Station 5k Tunnel Run/Open House at Cheyenne Mountain Air Force Station, Colo., on May 26, 2016. Known as America’s Fortress, CMAFS celebrates its 50th year as an operational Air Force Station. (U.S. Air Force photo by Airman 1st Class Dennis Hoffman)

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Cheyenne Mountain Hosts 5K Tunnel Run and Open House

Runners race up the mountain at the Cheyenne Mountain Air Force Station 5k Tunnel Run/Open House at Cheyenne Mountain Air Force Station, Colo., on May 26, 2016. Participants had the opportunity to pause along the route, to experience the blast doors and information and historical booths. (U.S. Air Force photo by Airman 1st Class Dennis Hoffman)

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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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Cheyenne Mountain Hosts 5K Tunnel Run and Open House

Runners trade the sun for the cool dark at the south entrance of the tunnel into Cheyenne Mountain Air Force Station during the CMAFS 5k Tunnel Run/Open House May 26, 2016. Since its inception during the Cold War through the war on terrorism, Cheyenne Mountain has remained critical to the defense mission providing command and control for the nation since 1966. (U.S. Air Force photo by Staff Sgt. Amber Grimm)

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Cheyenne Mountain Hosts 5K Tunnel Run and Open House

Runners travel a long stretch of dark tunnel through the heart of Cheyenne Mountain Air Force Station during the CMAFS 5k Tunnel Run/Open House May 26, 2016. The event was part of the ongoing 50th anniversary celebration of the “Americas Fortress” becoming fully operational. (U.S. Air Force photo by Staff Sgt. Amber Grimm)

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Cheyenne Mountain Hosts 5K Tunnel Run and Open House

Participants in the Cheyenne Mountain Air Force Station 5k Tunnel Run/Open House had a chance to pause and take in the history of “Americas Fortress” on May 26, 2016. Since its inception during the Cold War through the war on terrorism, Cheyenne Mountain has remained critical to the defense mission providing command and control for the nation since 1966. (U.S. Air Force photo by Staff Sgt. Amber Grimm)

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Cheyenne Mountain Hosts 5K Tunnel Run and Open House

Runners celebrate finally seeing the light at the end of the tunnel during the Cheyenne Mountain Air Force Station 5k Tunnel Run/Open House at Cheyenne Mountain Air Force Station, Colo., on May 26, 2016. Since its inception during the Cold War through the war on terrorism, Cheyenne Mountain has remained critical to the defense mission providing command and control for the nation since 1966. Cheyenne Mountain AFS is owned by the 21st Space Wing at Peterson Air Force Base, and operated by the 721st Mission Support Group. (U.S. Air Force photo by Airman 1st Class Dennis Hoffman)

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Cheyenne Mountain Hosts 5K Tunnel Run and Open House

Published June 1, 2016
21st Space Wing Public Affairs

CHEYENNE MOUNTAIN AIR FORCE STATION, Colo. -- Runners take off from the starting line at the Cheyenne Mountain Air Force Station 5k Tunnel Run/Open House at Cheyenne Mountain Air Force Station, Colo., on May 26, 2016. Known as America’s Fortress, CMAFS celebrates its 50th year as an operational Air Force Station. (U.S. Air Force photo by Airman 1st Class Dennis Hoffman)