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.

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.