For years, North American Aerospace Command — or NORAD — had its headquarters inside Cheyenne Mountain, at the foot of the Rocky Mountains in Colorado. In this archival photo, a bus enters a tunnel for a half-mile trip to a command center inside the Cheyenne complex. The headquarters is now in nearby Colorado Springs. Kevin Moloney/Getty Images hide caption
Every year, NORAD staff and volunteers field calls from children inquiring about Santa. Canadian Brig. Gen Guy Hamel joined in the tradition in 2014. Brennan Linsley/AP hide caption
U.S. Northern Command Chief of Staff Maj. Gen. Charles D. Luckey joins volunteers taking phone calls from children during the annual NORAD Tracks Santa Operation, at the North American Aerospace Defense Command, at Peterson Air Force Base, Colo. Photo taken on Christmas Eve, 2014. Brennan Linsley/AP hide caption
Col. Harry Shoup came to be known as the "Santa Colonel." He died in 2009. Courtesy of NORAD hide caption
The view Friday morning on NORAD's "Santa Tracker." North American Aerospace Defense Command hide caption
