This undated U.S. Air Force photo shows Gen. Lori Robinson, the new commander of the North American Aerospace Defense Command (NORAD), and U.S. Northern Command at Peterson Air Force Base, Colo. (U.S. Air Force via AP) **FILE**
Adm. James G. Stavridis (left), U.S. European Command and Supreme Allied Commander, Europe, and Gen. Charles H. Jacoby, Jr. (center), U.S. Northern Command and Commander of the North American Aerospace Defense Command, listen while Marine Gen. John F. Kelly answers a question while testifying before the Senate Armed Services Committee on Capitol Hill in Washington on March 19, 2013. (Associated Press)
Volunteers take phone calls from children asking where Santa is and when he will deliver presents to their house during the annual NORAD Tracks Santa Operation at the North American Aerospace Defense Command (NORAD) at Peterson Air Force Base in Colorado Springs, Colo., on Monday Dec. 24, 2012. More than a thousand volunteers at NORAD handle more than 100,000 thousand phone calls from children around the world every Christmas Eve, with NORAD continually projecting Santa's supposed progress delivering presents. (AP Photo/Brennan Linsley)