This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Oct Cheyenne Mt Ext const earthmover. NORAD blast doors Cheyenne Mountain Colorado USAF photo URL cheyennemountain af mil PDUSGov Construction of Cheyenne Mountain Complex Road transport in Colorado in Colorado Dump trucks in the United States Offroad dump trucks October in the United States Photographs taken on