U.S. Navy Capt. Dave Shiveley, surgeon general director for the North American Aerospace Defense Command and U.S. Northern Command, tours the 601st Air and Space Operations Center at Tyndall Air Force Base, Fla., Jan. 19. Shiveley visited with Air Forces Northern's surgeon general staff and participated in casualty evacuation training at nearby Hurlburt Field, Fla., Jan. 17-19. (U.S. Air Force photo by Angela Pope)