On The Cover: A2C Buzz G. Jackson of Waco, Texas, and his sentry dog Duke stand guard near an HH-43 helicopter on the flight line at Pleiku Air Base, 1966. U.S. Air Force Photo, National Archives and Records Administration.On The Cover: A2C Buzz G. Jackson of Waco, Texas, and his sentry dog Duke stand guard near an HH-43 helicopter on the flight line at Pleiku Air Base, 1966. U.S. Air Force Photo, National Archives and Records Administration.