Zombies! Run!
Participants embark at the start of the Zombie Tunnel 5k Fun Run at Cheyenne Mountain Air Force Station, Colorado, Oct. 20, 2017. The run wound around Cheyenne Mountain, with zombies awaiting runners along the way. (U.S. Air Force photo by Airman 1st Class William Tracy)

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Photo by: Steve Kotecki |  VIRIN: 171023-F-NM764-991.JPG