TYNDALL AIR FORCE BASE, Fla. -- Tech. Sgt. Kathleen O'Brien (right) points out tracks of interest to Tech. Sgt. Christie Watson in the 1st Air Force and Continental U.S. North American Aerospace Defense Command Region combined air operations center here. The center will be one of three primary elements in the new Air Force North warfighting headquarters. (U.S. Air Force photo by 2nd Lt. Albert Bosco)