For the past 70 years, staff at the North American Aerospace Defence Command – or NORAD - in Colorado Springs have had a very important task: tracking Santa.
NORAD spokeswoman Colonel Kelly Frushour says Santa is of course no threat.
It's just that the same combination of radar, satellites and jets that help NORAD carry out its mission throughout the year make it capable of tracking Santa.
The Colonel says there's also a hotline to answer callers' questions about Santa's mission - and Michelle Martin is one of the NORAD planners for the Christmas call centre.
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